I made a prototype out of legos for one. I'm using a delta silentek fan running 6 volts instead of 12 to keep noise down. I just used a spare ac-dc adaper I had laying around. It brought my laptop down about 8-10 degrees (f) Also, I know this site isnt complete, I'm working on it.

Mobile-2.2Ghtz Core 2 Macbook, 4GB ram, 160GB HDD
Server-Dual 1.42 MDD G4, 1GB ram, 4 random hard drives.
PC-C2D 2.4Ghtz, Asus Commando, 2Gb ram, 3 hdd's in raid 5, 8800GTS.