Unreal Tournament 2004 - I'm running it on my 17" MBP at a resolution of 1920x1200 with everything on max and it is super sweet! So on your lower res 15" MBP it should run even better
Just make sure you put the sound up cos those fans get pretty damn noisy and don't even think about keeping it on your laptop while playing cos you WILL get burnt.
if you install boot camp your macbook pro is like any other windows laptop: it can play any pc game if its above the minimum specs.
but if you want to play games while in Mac OS X make sure you get intel or universal binary games.
next time do a bit of searching as the mac rumors forums has an excellent page here/ listing all the Mac OS X games and whether they are power pc, intel or universal and whether they play well in rosetta (power pc on intel)
I've got Oblivion on my 360 and I think it's a genius game - I love it. But I always thought it would take too high a toll on the MBP. If it does work well then I'd love to be able to have a quick go on it wherever I happen to be!
What settings have you got it running at and how smooth is the frame rate?