I've had some interesting ideas related to heat transfer that I haven't seen anyone try. First is using suction to remove hot air from deep inside a heatsink.

I've had some interesting ideas related to heat transfer that I haven't seen anyone try. First is using suction to remove hot air from deep inside a heatsink. This seems like it would work better than just randomly flinging heated air around. The second involves actually moving the heatsink. Imagine something like the Sandia cooler, but as a centerless ring about a foot in diameter, and spinning at only 1 rpm. The heat source would be at a spot under the spinning ring. A bushing would transfer heat by touching both the CPU and the ring. Each part of the ring has plenty of time to cool down a bit by the time it comes back around to touch the CPU again. Basically there is always cool metal on the other side of the bushing. These are both concepts I've thought a bit about, but just don't have time to work on.