Thinking about it now, it seems to me Microsoft is just doing what Macromedia did a while back, and that is to get blogs to get some marketting momentum. Now though, you dont hear about Macromedia blogs, but you will continue to hear about Microsoft. People either love them or hate them, but every body has something to say about Microsoft, and its software.
So far this has turned out good for them! Will it help them get developers behind thier backs?