diff --git a/src/services/classifier.ts b/src/services/classifier.ts
index e5e68f06296..7e69e55c317 100644
--- a/src/services/classifier.ts
+++ b/src/services/classifier.ts
@@ -176,7 +176,7 @@ module TypeScript.Services {
         }
     }
 
-    export interface IClassifierHost extends TypeScript.ILogger {
+    export interface IClassifierHost extends TypeScript.Logger {
     }
 
     export class ClassificationResult {
diff --git a/src/services/compiler/diagnostics.ts b/src/services/compiler/diagnostics.ts
index 75d7bfd5a78..d759c8bf014 100644
--- a/src/services/compiler/diagnostics.ts
+++ b/src/services/compiler/diagnostics.ts
@@ -16,7 +16,7 @@
 ///<reference path='references.ts' />
 
 module TypeScript {
-    export interface ILogger {
+    export interface Logger {
         information(): boolean;
         debug(): boolean;
         warning(): boolean;
@@ -25,7 +25,7 @@ module TypeScript {
         log(s: string): void;
     }
 
-    export class NullLogger implements ILogger {
+    export class NullLogger implements Logger {
         public information(): boolean { return false; }
         public debug(): boolean { return false; }
         public warning(): boolean { return false; }
@@ -35,7 +35,7 @@ module TypeScript {
         }
     }
 
-    export function timeFunction(logger: ILogger, funcDescription: string, func: () => any): any {
+    export function timeFunction(logger: Logger, funcDescription: string, func: () => any): any {
         var start = (new Date()).getTime();
         var result = func();
         var end = (new Date()).getTime();
diff --git a/src/services/coreServices.ts b/src/services/coreServices.ts
index 2e34f646649..0f725d3d6be 100644
--- a/src/services/coreServices.ts
+++ b/src/services/coreServices.ts
@@ -23,7 +23,7 @@ var debugObjectHost = (<any>this);
 module TypeScript.Services {
 
     export interface ICoreServicesHost {
-        logger: TypeScript.ILogger;
+        logger: TypeScript.Logger;
     }
 
     export class CoreServices {
diff --git a/src/services/formatting/rulesProvider.ts b/src/services/formatting/rulesProvider.ts
index 0b100500f2d..2ff436d123d 100644
--- a/src/services/formatting/rulesProvider.ts
+++ b/src/services/formatting/rulesProvider.ts
@@ -22,7 +22,7 @@ module TypeScript.Services.Formatting {
         private activeRules: Rule[];
         private rulesMap: RulesMap;
 
-        constructor(private logger: TypeScript.ILogger) {
+        constructor(private logger: TypeScript.Logger) {
             this.globalRules = new Rules();
         }
 
diff --git a/src/services/languageService.ts b/src/services/languageService.ts
index de526c9ee6b..8c656a53f84 100644
--- a/src/services/languageService.ts
+++ b/src/services/languageService.ts
@@ -21,7 +21,7 @@ module TypeScript.Services {
     //
     // Public interface of the host of a language service instance.
     //
-    export interface ILanguageServiceHost extends TypeScript.ILogger, TypeScript.IReferenceResolverHost {
+    export interface LanguageServiceHost extends TypeScript.Logger, TypeScript.IReferenceResolverHost {
         getCompilationSettings(): ts.CompilerOptions;
 
         getScriptFileNames(): string[];
@@ -38,7 +38,7 @@ module TypeScript.Services {
     // Public services of a language service instance associated
     // with a language service host instance
     //
-    export interface ILanguageService {
+    export interface LanguageService {
         // Note: refresh is a no-op now.  It is only around for back compat purposes.
         refresh(): void;
 
@@ -83,7 +83,7 @@ module TypeScript.Services {
         dispose(): void;
     }
 
-    export function logInternalError(logger: TypeScript.ILogger, err: Error) {
+    export function logInternalError(logger: TypeScript.Logger, err: Error) {
         logger.log("*INTERNAL ERROR* - Exception in typescript services: " + err.message);
     }
 
diff --git a/src/services/pullLanguageService.ts b/src/services/pullLanguageService.ts
index dd4243a4ea1..88aeccf81d7 100644
--- a/src/services/pullLanguageService.ts
+++ b/src/services/pullLanguageService.ts
@@ -40,7 +40,7 @@ module TypeScript.Services {
         private _filenameToEntry: ts.Map<HostFileInformation>;
         private _compilationSettings: ts.CompilerOptions;
 
-        constructor(private host: ILanguageServiceHost) {
+        constructor(private host: LanguageServiceHost) {
             // script id => script index
             this._filenameToEntry = {};
 
@@ -123,7 +123,7 @@ module TypeScript.Services {
         private _currentFileSyntaxTree: TypeScript.SyntaxTree = null;
         private _currentFileScriptSnapshot: TypeScript.IScriptSnapshot = null;
 
-        constructor(private _host: ILanguageServiceHost) {
+        constructor(private _host: LanguageServiceHost) {
             this._hostCache = new HostCache(_host);
         }
 
@@ -381,8 +381,8 @@ module TypeScript.Services {
         }
     }
 
-    export function createLanguageService(host: ILanguageServiceHost, documentRegistry: IDocumentRegistry) :ILanguageService{
-        var logger: TypeScript.ILogger = host;
+    export function createLanguageService(host: LanguageServiceHost, documentRegistry: IDocumentRegistry) :LanguageService{
+        var logger: TypeScript.Logger = host;
         var _syntaxTreeCache: SyntaxTreeCache = new SyntaxTreeCache(host);
         var formattingRulesProvider: Formatting.RulesProvider;
         var hostCache: HostCache; // A cache of all the information about the files on the host side.
diff --git a/src/services/shims.ts b/src/services/shims.ts
index 53e44b262e7..ddab3b75fe2 100644
--- a/src/services/shims.ts
+++ b/src/services/shims.ts
@@ -38,7 +38,7 @@ module TypeScript.Services {
     //
     // Public interface of the host of a language service shim instance.
     //
-    export interface ILanguageServiceShimHost extends TypeScript.ILogger {
+    export interface ILanguageServiceShimHost extends TypeScript.Logger {
         getCompilationSettings(): string;
 
         // Returns a JSON encoded value of the type:
@@ -79,7 +79,7 @@ module TypeScript.Services {
     }
 
     export interface ILanguageServiceShim extends IShim {
-        languageService: TypeScript.Services.ILanguageService;
+        languageService: TypeScript.Services.LanguageService;
 
         dispose(dummy: any): void;
 
@@ -283,7 +283,7 @@ module TypeScript.Services {
         }
     }
 
-    export class LanguageServiceShimHostAdapter implements TypeScript.Services.ILanguageServiceHost {
+    export class LanguageServiceShimHostAdapter implements TypeScript.Services.LanguageServiceHost {
         constructor(private shimHost: ILanguageServiceShimHost) {
         }
 
@@ -389,7 +389,7 @@ module TypeScript.Services {
         }
     }
 
-    export function simpleForwardCall(logger: TypeScript.ILogger, actionDescription: string, action: () =>any): any {
+    export function simpleForwardCall(logger: TypeScript.Logger, actionDescription: string, action: () =>any): any {
         logger.log(actionDescription);
         var start = Date.now();
         var result = action();
@@ -405,7 +405,7 @@ module TypeScript.Services {
         return result;
     }
 
-    export function forwardJSONCall(logger: TypeScript.ILogger, actionDescription: string, action: () =>any): string {
+    export function forwardJSONCall(logger: TypeScript.Logger, actionDescription: string, action: () =>any): string {
         try {
             var result = simpleForwardCall(logger, actionDescription, action);
             return JSON.stringify({ result: result });
@@ -421,11 +421,11 @@ module TypeScript.Services {
     }
 
     export class LanguageServiceShim extends ShimBase implements ILanguageServiceShim {
-        private logger: TypeScript.ILogger;
+        private logger: TypeScript.Logger;
 
         constructor(factory: IShimFactory,
                     private host: ILanguageServiceShimHost,
-                    public languageService: TypeScript.Services.ILanguageService) {
+                    public languageService: TypeScript.Services.LanguageService) {
             super(factory);
             this.logger = this.host;
         }
@@ -802,7 +802,7 @@ module TypeScript.Services {
     }
 
     export class CoreServicesShim extends ShimBase {
-        public logger: TypeScript.ILogger;
+        public logger: TypeScript.Logger;
         public services: TypeScript.Services.CoreServices;
 
         constructor(factory: IShimFactory, public host: TypeScript.Services.ICoreServicesHost) {
diff --git a/src/services/typescriptServices.ts b/src/services/typescriptServices.ts
index 505fd9b6ac5..04617b00725 100644
--- a/src/services/typescriptServices.ts
+++ b/src/services/typescriptServices.ts
@@ -160,7 +160,7 @@ module TypeScript.Services {
         private _shims: IShim[] = [];
         private documentRegistry: DocumentRegistry = new DocumentRegistry();
 
-        public createPullLanguageService(host: TypeScript.Services.ILanguageServiceHost): TypeScript.Services.ILanguageService {
+        public createPullLanguageService(host: TypeScript.Services.LanguageServiceHost): TypeScript.Services.LanguageService {
             try {
                 return TypeScript.Services.createLanguageService(host, this.documentRegistry);
             }