Interestingly enough, most of the time Microsoft was ignoring or just pushing Agile methodologies and practices in the real of development issues. This is the first time I see them classifying Agile as an architectural concern, the same I always did.
Maybe I'm unconciously biased by my current (almost full-time) job at Microsoft, but i smell changes...
The Open Source site (notice the home animation is still using Flash)
Silverlight and all its ecosystem been free and truly multi-platform
The very recent release of part of the .NET Source code
... and now this site (that probably has been there since a lot of time and I didn't notice).