Think Techie.com have put up a how-to article on water-cooling resevoirs. Here is a Quote:
"Since the advent of the famous Intel Celeron 300A dream processor, many have tried to squeeze out a few extra Mhz out of their machines. When people realized that the main problem was heat, they started exploring different options on cooling their processors better to achieve stability at higher overclocking speeds. Different and extravagant heatsinks designs came out; mostly big, bulky, and as noisy as a 747 taking off. Then one day, a radical computer enthusiast said, "hey what about water"