I just ran across Don Burn’s new(ish) WDK-focused, at http://msmvps.com/blogs/WinDrvr. Don is a longtime contributor to the community and I like the direction he’s gone with his first few posts.
In addition to the basic driver dev stuff, he’s getting into some important higher-level stuff like source control and using undocumented features. I bet I could have guessed his opinion on both topics before reading, though. 
*Added to my RSS reader*