The timing of A List Apart is freaky... This weekend I spent a great deal of time digging through various hard-geek documents and specs, trying to get my head around doctypes. Then this morning I cruise on over to ALA, e voila! Fixing Your Site With the Right DOCTYPE. Not only but also... their forums are back! ALA, with forums for extra shine!
On a related note, I didn't know that there are tutorials on the W3C site! That's surprisingly friendly. Most of W3C's content is very hardcore geek.