Ok, so this is inspired by some of my own issues and instant solutions but the idea is post your Ghetto fabulous mods. I'll give some examples of my own.
The 310mm Case fan.
My computer was over-heating during WoW raids and shutting off. I took the case apart, removed a case window and mounted a oscilating floor fan (with the base removed) directly over the CPU. I ended up burning out several of the internal fans due to the increased air pressure on their blades, but was able to keep the PC comfortably cool.
Phase change conductive cooling:
Overheating laptop had a metal plate on the bottom that conducted heat from the cpu. After having my leg burt repeatedly by the panel (hot enough it burned the paint off of the case) I began operating the laptop ontop of several ice-packs. The heat would be conducted right into the icepack which melted, and was replaced with a fresh ice pack every hour or so.