Sara Ford's Blog
I am surprised when I talk to developers these days and they don't know who Sara Ford is. She's responsible for CodePlex and many open source initiatives at Microsoft. In addition, her blog is an excellent source of information on Visual Studio tricks and features that most of us have never noticed. It is well worth a read. Just announced today, her blog is now available in Russian and Spanish so if English isn't your native tongue, you're in luck there too.
Wonder how I get someone to translate my blog into other languages ;)