Wintellect's Blog
I don't really like the idea of creating a blog that is just filled with links to other blogs, but I'm willing to make an exception for Wintellog, from the folks at Wintellect. For those of you who don't know, Wintellect has been associated with some of .NET books available.
Their titles include Applied Microsoft .NET Framework Programming by Jeffrey Richter, which is one of the tomes of our trade. We all love it where I work, and we recommend it to other developers we have contact with.