Gaming is important to me although I am still battling the age old question of laptop versus desktop. I am about to buy either an MBP or iMAC in the next week as I need it for work. Would be nice to mix some pleasure in there tooTHANKS!
I don't think any Mac is going to be a good solution for the hardcore gamer.
At the moment the best recommendation for gaming would definitely be the 3.06GHz iMac with the nVidia 8800 though. Save the money left over that you would have spent for a Mac Pro for gaming and just build a Windows gaming box or buy a console.