Tom blogged about his benchtop power supply using the ATX breakout board he won in the 7400 competition:
This time the build was going to be so much easier. I had the great fortune to win an ATX breakout board from Dangerous Prototypes in the 7400 logic competition. Once I had liberated the power supply from the PC tower, the work of 4 minutes 59 seconds, I simply plugged the large connector into the back of the PCB. Bada bing. It literally took me longer to find the “ON” switch.
You can get one for $14 at Seeed Studio.
You can also get a Sick of Beige case for your ATX breakout board for $4 at Seeed.