This may be an obvious observation to some, but I just think it's fantastic to see how features from Microsoft Research videos from 2 or 3 years ago [http://www.aisto.com/roeder/ip/] show up directly in products today.  What a concept! R&D dollars that go directly into shipping products! :)  This Video on Intentional Programming shows a number of more superficial features that are currently in Visual Studio.NET. 

Aside from these few features they've brought forward like the Compile Error Todo List, I'd like to see how the CodeDom  would end up being used in a more far-reaching IP implementation on top of the .NET CLR.