LIST OF PARTS I USED (Links updated May 2012):

1W 445nm Laser diode in aixiz module and lens -  http://bit.ly/LejEgU (buy the $64 version)
Heatsink  - http://bit.ly/KZIKWk (Select the HS-1a for $16)
Driver board - http://bit.ly/9go5LG
Switch - http://bit.ly/wYVCHu
Thermal/Isolating tape - http://bit.ly/9Esv7V
Many parts can be had for cheaper than the above links. Google it.