My launch system's DVD drive died after spinning Fable 2 for 3 days straight. No RROD.
Luckily I have another 360, an Elite. This one got the 3 red lights after I got Gears 2. Never really used it at all. I fell asleep one night playing Gears 2. Woke up and my 360 showed the 3 red lots. I turned it off and turned it back on again. It hasn't done it since. It seems that there was a power surge that reset my computer and I guess it affected the 360 also.