I have a PCMods fanbus. It plugs in to a regular molex connector from the PS. Then it has 4 seperate places to hook bare wires into from your fans. Each one is controlled by a toggle switch allowing for.... full on, half on, or off. That way you can control how much cooling you need for whatever your doing. Less for surfing, more for gaming.
What I did was take an old PS and cut off the molex connectors and wired them to the fanbus before I installed it. The way this one is set up, you cant hook anything to it when it's in place. You have to pull the face plate and wire stuff up that way. So I took all the molex connectors from the old PS and prewired them onto the fanbus so I can just pop the case's side panel open and switch stuff around or hook up new stuff easily. It works great.