If you are into extreme cooling and overclocking you will want to take a look at CPUfx's Z4 Intercooler @ TechSpot.com, a complete kit packed with everything you will need to get you started for watercooling your PC.

An upgrade from the popular Z3 kit we tested about a year ago, now featuring an inline 12v pump and if you ask for it, a GeForce4 waterblock for watercooling your videocard, too.

CPUfx Z4 Watercooling Kit