My Xbox 360 has been freezing when I'm playing PDZ, PGR3, and Halo 2. It would freeze about the same time after I load the game. The game would freeze somewhere within the game and the ring of light doesn't change, it's still green with the one controller I have connected.
I played Kameo thought for almost an hour without hiccups, the rest of the games I tried would crap out within 10 minutes.
I don't think this is an overheating issue, sure the CD comes out piping hot but the air blowing out the console is cool. Oh, and I even tried turning it on the side to see if it helped but it doesn't. Well, back to playing more Kameo. I hope it's somekind of software issue which can be fixed instead of something hardware.