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Most useful free .NET libraries?

I have used a lot of free .NET libraries, some from Microsoft itself! Which you found the most useful?

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		[Ajax Control Toolkit](http://www.codeplex.com/AjaxControlToolkit)
	
		[ASP.NET MVC Project Awesome](http://awesome.codeplex.com/) (ajax toolkit for asp.net mvc)
	
		[Silverlight Toolkit](http://www.codeplex.com/silverlight)
	
		[nUnit](http://www.nunit.org/)
	
		[Rhino Mocks](http://ayende.com/projects/rhino-mocks.aspx) (Unit Test against Fake Resources)
	
		[Moq](http://code.google.com/p/moq/) (Unit Test against Fake Resources Alternative)
	
		[Flickr.Net](http://flickrnet.codeplex.com/)
	
		[Live Services SDK](http://msdn.microsoft.com/en-us/library/bb264574.aspx?ppud=4)
		
			
				The following APIs are available to Live Services developers.
				
					
						[Live Framework SDK](http://dev.live.com/liveframework/)
					
						Live Services User Data APIs
					
						[Microsoft Virtual Earth SDKs](http://dev.live.com/virtualearth/)
					
						[Live Search API](http://dev.live.com/livesearch/)
					
						[Windows Live Messenger SDKs](http://dev.live.com/messenger/)
					
						[Windows Live ID SDK](http://dev.live.com/liveid/)
					
						Microsoft Advertising APIs
					
						[Silverlight Streaming SDK](http://dev.live.com/silverlight/)
					
						[Windows Live Admin Center SDK](http://dev.live.com/admincenter/)
					
						Windows Live Tools for Visual Studio Controls
					
						[Windows Live Spaces SDK](http://dev.live.com/spaces/)
					
						[Windows Live Client Extensibility APIs](http://msdn.microsoft.com/en-us/library/dd179336.aspx)
					
						[Contacts API](http://dev.live.com/contacts/)
					
						[FeedSync](http://dev.live.com/feedsync/) (Core of LiveMesh Technology)
				
			
		
	
	
		[Facebook Developer Toolkit](http://facebooktoolkit.codeplex.com/)
	
		[Castle Windsor](http://www.castleproject.org/container/index.html) (DI)
	
		[Open XML SDK 2.0](http://www.microsoft.com/downloads/details.aspx?FamilyID=c6e744e5-36e9-45f5-8d8c-331df206e0d0&DisplayLang=en) (Create/Edit Word/Excel/PowerPoint 2007 Formats)
	
		[CSLA Framework](http://www.lhotka.net/) (Business Objects Framework)
	
		[TypeMock.Net](http://www.typemock.com/) (Another Mocking framework)
	
		[Silverlight.FX](http://projects.nikhilk.net/SilverlightFX) (Additional Silverlight Controls)
	
		[ScriptSharp](http://projects.nikhilk.net/ScriptSharp) (A Javascript Framework)