The official blog of the Escalation Engineers inside Microsoft's Product Support Staff (PSS) for SQL Server. These guy's come across the toughest issues and often uncover bugs in the product long before it's officially published. Keep an eye on these posts for some of the best information around.

The SQL Server Customer Advisory Team (SQLCAT) is  - according to their web site - "the largest SQL Server implementation team". This means they are privy to the best information about SQL Server. Their web site is awesome and so is there blog. 

For all of the developers out there, we have the ADO.NET Team's blog. Do you want to know the future of Linq to SQL (L2S)? Not sure if Linq or the Entity Framework would work best for you? Did you know that Sybase's SQL Anywhere supports the Entity Framework? Find out all of this in the blog!

All about "Best Practives, Tips, Benchmarks, Troubleshooting and Monitoring - SQL Server."