Over the past few years, Microsoft has gotten big on blogging. A number of employees blog their activities to a personal blog. Additionally, a number of product teams blog, as a team. Some of these, such as You Had Me At EHLO (The Exchange Team Blog) are fantastic, with re rest mostly very good.
Naturally, there's a page to see an Official list of Microsoft Team Blogs / Microsoft Blogs!
There is some great information here -if you have the time to read it all!