http://www.dangerden.com/
http://www.tellurex.com/Crazy stuff if you ask me I will stick with air cooling. Make sure you know what you are doing and take in consideration most create condensation which can be a very bad thing.
Pentium 3 1000 @ 1195, Abit bx-133, 256 Mb Mushkin Rev.3 cas 2-2-2, Leadtek GeForce 3 Air Cooled. 
AMD Thunderbird 1.33 @ 1.5 (24/7) IWILL KK266R , Corsairs pc 150 cl2, Leadtek GeForce 3
