About 100 sources, including:

-Official msdn blogs
-Official asp.net blogs
-Various tech news sites, such as Slashdot and Engadget.
-Specific individual blogs, such as Scott Gu, Stephen Walther, Scott Hanselman, Somasegar, John Resig.
-UX sites such as Smashing Magazine.
-Microsoft news followers Paul Thurrott and Mary Jo Foley.