My 360 was crashing a lot (like once every 20 minutes). So I took the power supply off the ground and suspended it in the air with some string. I have been playing for about 3 hours straight and no crashes so far!
EDIT: I found an easier way to do this. I got a box with no cover and put the power supply on the edges.
ROTFLMAO!!! WOW! JUST WOW! Great quality control Microsoft!