I figured that I'd throw myself into the mix here. I had been having BSoDs on my Week 01 Pro only in Steam on CrossOver. It would crash in every game, Team Fortress 2, HL2, Portal, etc. I had never had any problems with native CoD4. I was dealing with the problem with smcfancontrol, which minimized but did not eliminate the crashes. I took in my computer, not to fix this problem, but to fix a broken ethernet port. My receipt says they're going to replace the logic board, which, now reading this thread, makes me nervous. Hopefully, it all turns out for the best.
To answer the previous post, I'm also fairly sure that the graphics update today was targeted at the Dual-link display adapters and HD video playback.