I had the idea the other day. as many of us know/ have heard, water cooling is good, and is the best form of cooling (unless you consider using liquid Nitrogen feaseable). well, if you could submerge your entire motherboard in water, it would be cooled very well, although it would short out almost instantaniously. which is why I thought of submerging a computer in UltraPure water. UltraPure water is water that has had everything but H2O filtered out, and hence is no longer conductive. But will still conduct heat.
if you built a minature cleenroom that was vacume sealed and had a way to allow wires from your CD, DVD, and floppy drive(s) into it, and preferably had the pipes from a normal water cooling kit leading in and out of it, you could have a very overclockable computer. you would just have to keep contaminates out of the water.
(this was just an idea i decided to share with you guys, incase anyone wanted to try it)