All the official Microsoft Team Blogs are now listed on BlogMS. These are blogs maintained by the product teams and contain tons of good information about what’s going on with our products. Here’s the link to BlogMS.
In case you’re wondering why my blog isn’t listed on the front page, I’m a consultant who works in the field. I’m not part of the product development teams so my blog isn’t considered “official” in the same way these are. My blog is listed, it’s just buried in the 171 Microsoft blogs that are SQL Server related.