Holy poop! This is huge!

I know Scott was leading the charge in a general source code cleanup which started some times ago, but it looks like they're nearly done! This is amazing - from within VS 2008 (or your favourite source code editor), you'll be able to seemlessly single-step debug from your own code in that of the .NET framework itself.

Bravo Microsoft! This is an incredibly symbolic step!

http://weblogs.asp.net/scottgu/archive/2007/10/03/releasing-the-source-code-for-the-net-framework-libraries.aspx