have a 0102 here, a little more info on mine -- my 360 worked fine for the first month or two, no problems at all. then at some point after getting Oblivion and playing for a few dozen hours, the 360 would occasionally have disc read errors -- sometimes reading the disc as dirty, sometimes mistakening it for a DVD (the whole concept of getting the "please put this disc in an Xbox360" error message while the disc is actually in the 360 would be funny otherwise

). Usually after a reboot or two, all would be well. This continued for a while, but not that often. No other problems with the 360 during that time. Now in the past week or two, the 360 has had more and more of those same "disc-read" errors, until it would happen almost every time i booted up a disc (specific discs include Hitman, PDZ, Quake4 and a couple OXM demo discs). Today, after expecting it any day now, i got the three-red ring. I was able to boot up Hitman again later and play for a few before freezing. Now the system freezes either right before or during the 360 logo intro screen -- but curiously the red lights have not re-appeared since the logo freezes started.
just from a quick observation of how my 360 behaved, it seemed that there was some relation to the disc drive -- i had also noticed the drive makes a very small brief spin-noise (not unlike that old-school noise of a 3.5" drive looking for a disc, but much shorter in duration). I also noted that aside from the aforementioned disc problems, the 360 showed no other signs of trouble (live arcade, music, messaging, etc all have worked fine).
just wanted to throw a little more data out there...