Over @ Extremecooling they have posted a guide on (you guessed it) making a fan bus. As they say Do check it out! For under $4 US you can make one too. I'm off the get some parts ;-)Read more for info and link.
If you're an overclocker, you've probably got a lot of fans. Fans need power. One of the best ways to get power to the fans is thru a fanbus. With it, you can not only free up some of the power connectors in your computer, you can use a single switch to turn your fans on/off or even to a lower power (quiet) mode when the computer doesn't need as much cooling. Extremecooling