These are links on microsoft.com to resources that I have found useful:

MSDN Online Glossaries
Decode the latest term or acronym that has you stumped.

MSDN Online Recently Posted
A chronological list of all the latest information posted to the MSDN Online site.

MS Press Feature Article for Developers
Periodically, a new feature article is published here that is of interest to developers. The archive for earlier articles can be found here.

MSDN Online Site Map
Check out the vast array of sites that together represent MSDN Online.

Microsoft Support Webcasts
Tune in and watch live presentations given by Microsoft Support professionals, and participate in live Q&A sessions following each presentation.

Microsoft Clip Gallery Live
Expand your collection of clip art with this online gallery.

MSDN Online Newsgroups
Developer-focused public newsgroups through a Web-based client.

Microsoft DLL Help Database
Search the DLL Help database for information about file versions that ship with a selected set of Microsoft products.

Microsoft Knowledge Base
Search the vast Microsoft products & technology Knowledge Base.

MSDN Online Bug Center
Search specifically for known bugs in Microsoft Products.

Microsoft Download Center
The place to go to locate Microsoft downloads.

FAQ's by Product
FAQ directory for the most popular Microsoft products.

MSDN Online Code Center
The one-stop center for all your source-code needs at Microsoft.

SQL Server Weekly Quick Tips
Each week you'll find a new collection of user-submitted SQL Server tips.

MSDN Online Voices
MSDN's Online columns, such as Deep C# and More or Hess.