Shared Source Initiativehttp://www.microsoft.com/resources/sharedsource/default.mspx
http://referencesource.microsoft.com/serversetup.aspx
http://www.codeplex.com/NetMassDownloader
http://weblogs.asp.net/scottgu/archive/2007/10/03/releasing-the-source-code-for-the-net-framework-libraries.aspx
http://msdn.microsoft.com/en-us/netframework/default.aspx
http://blogs.msdn.com/rscc/