I didn't know about this Agile Center within the Architecture Center, but it is a great discovery (thanks to Roy for the tip).

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).