I was just wondering, in the release notes for beta driver 14.4, I read that the following bug/issue with the drivers has been resolved:
 : GPU hand in CrossFire Mode
I've tried getting crossfire to work on my dual 7950-system, but it seemed those cards were unsupported.
So to my regret, I gave up on ubuntu in favor of Win7 for gaming.
I kept hopeful for changes though
I just installed a BFG Nvidia based geforce 7950 gt OC edition card. the system is a updated / upgraded Lucid LTS. I have tried to get the drivers working by using nvidia-current and by adding the x-swat ppa and installing the 256.x series driver. I can in some cases get the card to function in 2d. I am unable to get compiz / effects working.