I've had problems with my latest MacBook Pro freezing, and a number of friends have politely suggested it's my fault. :) (You gotta love my friends!)
However, I saw an article this morning that makes me feel better. Apparently it's a fairly wide spread video driver issue. I feel better because a video driver can be fixed.
To be clear, the article is about the new iMacs, but I'm running the latest MacBook Pro. I've got the 4 gig capable version, so it's fairly recent.
Sometimes when I do a hard power down after a freeze, I can't restart. It just hangs during the boot screen. Booting in verbose mode (Apple + v) usually shows it hanging on the bluetooth bits, so I know it's not doing some sort of disk diagnostic. I've given it as long as 30 minutes to finish, and it never does.