Microsoft Hot Fix and Hot Issue Center
A new blog on technet appeared a few days ago, from the Hot Fix and KB content team.
The intent is to publish weekly all of the KB articles and hotfixes that were released. If it happens, and is updated regularly, it will be a great resource!
The blog is to include hotfixes and KBs for Windows Server, Windows Client, Exchange Server, IIS, SQL Server, etc.
Take a gander: http://blogs.technet.com/hot/default.aspx