Scott Guthrie, a GM in the division I work in (Developer Division) has just made a great post about how Microsoft will be releasing the source code of the .Net Framework libraries along with Visual Studio 2008.
I know, I know, the majority of you that develop using one of the .Net techologies use reflector, so this may not seem like a big deal but consider the demo that Scott walks through that shows the integration of debugging, source and symbols. This is such a win for .Net developers.
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The entire WPF blogroll is in on it. .NET Framework 3.5 will be open source based on the MS-Reference