Digikey parts:
Driver
FQP50N06L-ND N-Channel MOSFET x 1
2N5088BU-ND NPN Transistor x 1
100KXBK-ND 100K Ohm Resistor @ 1/4W x 1
P0.68W-1BK-ND .68 Ohm resistor @ 1W x1
Optional: CT2150-ND 5 Ohm Potentiometer
Fan Controllers
FQP50N06L-ND N-Channel MOSFET x 1
10K NTC 10K TNC Thermistor x1
D4AA14-ND 10K Trimmer pot x 1
Dealextreme
Cree P4 XR-E 7090 (WD) Emitter on Star (5-Pack) x 2
http://www.dealextreme.com/details.dx/sku.2134
Thermal Compound
http://www.dealextreme.com/details.dx/sku.13915 x1
Plugs
http://www.dealextreme.com/details.dx/sku.10788 x1
Driver
http://www.dealextreme.com/details.dx/sku.13552 x1
FutureElectronics
Royal Blues
http://www.componentsuperstore.com/s...IGHTING3584109
Green
http://www.componentsuperstore.com/s...IGHTING8781353