So along with the intel 965 docs, we now have 2 fairly well documented chips. So an excuse I've always heard from people turning up on irc channels is OMG I can't hack on GPU drivers there are no docs!!!. So now that we have these docs I'm expecting a large amount of developers to be able to bootstrap themselves on modern hardware. I wonder how disappointed I'm going to be.
updated: http://www.x.org/docs/AMD/ is the docs location, the newest pdf is the r500 3D engine manual.