diff --git a/src/browser/dom/DOMPropertyOperations.js b/src/browser/dom/DOMPropertyOperations.js
index 43bdf9c663..ae1e39d632 100644
--- a/src/browser/dom/DOMPropertyOperations.js
+++ b/src/browser/dom/DOMPropertyOperations.js
@@ -23,6 +23,7 @@ var DOMProperty = require('DOMProperty');
 
 var escapeTextForBrowser = require('escapeTextForBrowser');
 var memoizeStringOnly = require('memoizeStringOnly');
+var warning = require('warning');
 
 function shouldIgnoreValue(name, value) {
   return value == null ||
@@ -57,11 +58,10 @@ if (__DEV__) {
 
     // For now, only warn when we have a suggested correction. This prevents
     // logging too much when using transferPropsTo.
-    if (standardName != null) {
-      console.warn(
-        'Unknown DOM property ' + name + '. Did you mean ' + standardName + '?'
-      );
-    }
+    warning(
+      standardName == null,
+      'Unknown DOM property ' + name + '. Did you mean ' + standardName + '?'
+    );
 
   };
 }
diff --git a/src/browser/dom/components/LinkedValueUtils.js b/src/browser/dom/components/LinkedValueUtils.js
index ba5c0e618d..3136961cc8 100644
--- a/src/browser/dom/components/LinkedValueUtils.js
+++ b/src/browser/dom/components/LinkedValueUtils.js
@@ -22,6 +22,7 @@
 var ReactPropTypes = require('ReactPropTypes');
 
 var invariant = require('invariant');
+var warning = require('warning');
 
 var hasReadOnlyValue = {
   'button': true,
@@ -84,33 +85,31 @@ var LinkedValueUtils = {
     propTypes: {
       value: function(props, propName, componentName) {
         if (__DEV__) {
-          if (props[propName] &&
-              !hasReadOnlyValue[props.type] &&
-              !props.onChange &&
-              !props.readOnly &&
-              !props.disabled) {
-            console.warn(
-              'You provided a `value` prop to a form field without an ' +
-              '`onChange` handler. This will render a read-only field. If ' +
-              'the field should be mutable use `defaultValue`. Otherwise, ' +
-              'set either `onChange` or `readOnly`.'
-            );
-          }
+          warning(
+            !props[propName] ||
+            hasReadOnlyValue[props.type] ||
+            props.onChange ||
+            props.readOnly ||
+            props.disabled,
+            'You provided a `value` prop to a form field without an ' +
+            '`onChange` handler. This will render a read-only field. If ' +
+            'the field should be mutable use `defaultValue`. Otherwise, ' +
+            'set either `onChange` or `readOnly`.'
+          );
         }
       },
       checked: function(props, propName, componentName) {
         if (__DEV__) {
-          if (props[propName] &&
-              !props.onChange &&
-              !props.readOnly &&
-              !props.disabled) {
-            console.warn(
-              'You provided a `checked` prop to a form field without an ' +
-              '`onChange` handler. This will render a read-only field. If ' +
-              'the field should be mutable use `defaultChecked`. Otherwise, ' +
-              'set either `onChange` or `readOnly`.'
-            );
-          }
+          warning(
+            !props[propName] ||
+            props.onChange ||
+            props.readOnly ||
+            props.disabled,
+            'You provided a `checked` prop to a form field without an ' +
+            '`onChange` handler. This will render a read-only field. If ' +
+            'the field should be mutable use `defaultChecked`. Otherwise, ' +
+            'set either `onChange` or `readOnly`.'
+          );
         }
       },
       onChange: ReactPropTypes.func
diff --git a/src/browser/dom/components/ReactDOMOption.js b/src/browser/dom/components/ReactDOMOption.js
index cf007bf40e..784007b919 100644
--- a/src/browser/dom/components/ReactDOMOption.js
+++ b/src/browser/dom/components/ReactDOMOption.js
@@ -22,6 +22,8 @@ var ReactBrowserComponentMixin = require('ReactBrowserComponentMixin');
 var ReactCompositeComponent = require('ReactCompositeComponent');
 var ReactDOM = require('ReactDOM');
 
+var warning = require('warning');
+
 // Store a reference to the <option> `ReactDOMComponent`.
 var option = ReactDOM.option;
 
@@ -35,13 +37,12 @@ var ReactDOMOption = ReactCompositeComponent.createClass({
 
   componentWillMount: function() {
     // TODO (yungsters): Remove support for `selected` in <option>.
-    if (this.props.selected != null) {
-      if (__DEV__) {
-        console.warn(
-          'Use the `defaultValue` or `value` props on <select> instead of ' +
-          'setting `selected` on <option>.'
-        );
-      }
+    if (__DEV__) {
+      warning(
+        this.props.selected == null,
+        'Use the `defaultValue` or `value` props on <select> instead of ' +
+        'setting `selected` on <option>.'
+      );
     }
   },
 
diff --git a/src/browser/dom/components/ReactDOMTextarea.js b/src/browser/dom/components/ReactDOMTextarea.js
index 5b9ada60a6..a8aa82f661 100644
--- a/src/browser/dom/components/ReactDOMTextarea.js
+++ b/src/browser/dom/components/ReactDOMTextarea.js
@@ -28,6 +28,8 @@ var ReactDOM = require('ReactDOM');
 var invariant = require('invariant');
 var merge = require('merge');
 
+var warning = require('warning');
+
 // Store a reference to the <textarea> `ReactDOMComponent`.
 var textarea = ReactDOM.textarea;
 
@@ -57,7 +59,8 @@ var ReactDOMTextarea = ReactCompositeComponent.createClass({
     var children = this.props.children;
     if (children != null) {
       if (__DEV__) {
-        console.warn(
+        warning(
+          false,
           'Use the `defaultValue` or `value` props instead of setting ' +
           'children on <textarea>.'
         );
diff --git a/src/core/ReactComponent.js b/src/core/ReactComponent.js
index 42d4cb62c5..7ce0d5c8dd 100644
--- a/src/core/ReactComponent.js
+++ b/src/core/ReactComponent.js
@@ -25,6 +25,7 @@ var ReactUpdates = require('ReactUpdates');
 var invariant = require('invariant');
 var keyMirror = require('keyMirror');
 var merge = require('merge');
+var monitorCodeUse = require('monitorCodeUse');
 
 /**
  * Every React component is in one of these life cycles.
@@ -116,6 +117,7 @@ function validateExplicitKey(component) {
   }
 
   message += ' See http://fb.me/react-warning-keys for more information.';
+  monitorCodeUse('react_key_warning');
   console.warn(message);
 }
 
@@ -136,6 +138,7 @@ function validatePropertyKey(name) {
     }
     ownerHasPropertyWarning[currentName] = true;
 
+    monitorCodeUse('react_numeric_key_warning');
     console.warn(
       'Child objects should have non-numeric keys so ordering is preserved. ' +
       'Check the render method of ' + currentName + '. ' +
diff --git a/src/core/ReactCompositeComponent.js b/src/core/ReactCompositeComponent.js
index 14ca7d2cce..222fe97dc9 100644
--- a/src/core/ReactCompositeComponent.js
+++ b/src/core/ReactCompositeComponent.js
@@ -33,8 +33,10 @@ var invariant = require('invariant');
 var keyMirror = require('keyMirror');
 var merge = require('merge');
 var mixInto = require('mixInto');
+var monitorCodeUse = require('monitorCodeUse');
 var objMap = require('objMap');
 var shouldUpdateReactComponent = require('shouldUpdateReactComponent');
+var warning = require('warning');
 
 /**
  * Policies that describe methods in `ReactCompositeComponentInterface`.
@@ -621,6 +623,7 @@ if (__DEV__) {
     var context = owner ? ' in ' + ownerName + '.' : ' at the top level.';
     var staticMethodExample = '<' + name + ' />.type.' + key + '(...)';
 
+    monitorCodeUse('react_descriptor_property_access', { component: name });
     console.warn(
       'Invalid access to component property "' + key + '" on ' + name +
       context + ' See http://fb.me/react-warning-descriptors .' +
@@ -904,12 +907,11 @@ var ReactCompositeComponentMixin = {
       'setState(...): takes an object of state variables to update.'
     );
     if (__DEV__){
-      if (partialState == null) {
-        console.warn(
-          'setState(...): You passed an undefined or null state object; ' +
-          'instead, use forceUpdate().'
-        );
-      }
+      warning(
+        partialState != null,
+        'setState(...): You passed an undefined or null state object; ' +
+        'instead, use forceUpdate().'
+      );
     }
     // Merge with `_pendingState` if it exists, otherwise with existing state.
     this.replaceState(
@@ -1332,11 +1334,13 @@ var ReactCompositeComponentMixin = {
         // ignore the value of "this" that the user is trying to use, so
         // let's warn.
         if (newThis !== component && newThis !== null) {
+          monitorCodeUse('react_bind_warning', { component: componentName });
           console.warn(
             'bind(): React component methods may only be bound to the ' +
             'component instance. See ' + componentName
           );
         } else if (!args.length) {
+          monitorCodeUse('react_bind_warning', { component: componentName });
           console.warn(
             'bind(): You are binding a component method to the component. ' +
             'React does this for you automatically in a high-performance ' +
@@ -1421,6 +1425,10 @@ var ReactCompositeComponent = {
 
     if (__DEV__) {
       if (Constructor.prototype.componentShouldUpdate) {
+        monitorCodeUse(
+          'react_component_should_update_warning',
+          { component: spec.displayName }
+        );
         console.warn(
           (spec.displayName || 'A component') + ' has a method called ' +
           'componentShouldUpdate(). Did you mean shouldComponentUpdate()? ' +
diff --git a/src/event/EventPluginHub.js b/src/event/EventPluginHub.js
index 74494c66a6..92c72618cc 100644
--- a/src/event/EventPluginHub.js
+++ b/src/event/EventPluginHub.js
@@ -26,6 +26,7 @@ var accumulate = require('accumulate');
 var forEachAccumulated = require('forEachAccumulated');
 var invariant = require('invariant');
 var isEventSupported = require('isEventSupported');
+var monitorCodeUse = require('monitorCodeUse');
 
 /**
  * Internal store for event listeners
@@ -168,6 +169,7 @@ var EventPluginHub = {
       // bubble.
       if (registrationName === 'onScroll' &&
           !isEventSupported('scroll', true)) {
+        monitorCodeUse('react_no_scroll_event');
         console.warn('This browser doesn\'t support the `onScroll` event');
       }
     }
diff --git a/src/utils/cloneWithProps.js b/src/utils/cloneWithProps.js
index 7113be7687..8a8483e744 100644
--- a/src/utils/cloneWithProps.js
+++ b/src/utils/cloneWithProps.js
@@ -22,6 +22,7 @@
 var ReactPropTransferer = require('ReactPropTransferer');
 
 var keyOf = require('keyOf');
+var warning = require('warning');
 
 var CHILDREN_PROP = keyOf({children: null});
 
@@ -36,13 +37,12 @@ var CHILDREN_PROP = keyOf({children: null});
  */
 function cloneWithProps(child, props) {
   if (__DEV__) {
-    if (child.props.ref) {
-      console.warn(
-        'You are calling cloneWithProps() on a child with a ref. This is ' +
-        'dangerous because you\'re creating a new child which will not be ' +
-        'added as a ref to its parent.'
-      );
-    }
+    warning(
+      !child.props.ref,
+      'You are calling cloneWithProps() on a child with a ref. This is ' +
+      'dangerous because you\'re creating a new child which will not be ' +
+      'added as a ref to its parent.'
+    );
   }
 
   var newProps = ReactPropTransferer.mergeProps(props, child.props);