OK, so a few moths ago I got a the XBOX 360, the only problem was I couldn't keep it in the cabinet with the door closed while I played because it would get really hot in there, and everyone knows what heat does to a 360! At the same time however I didn't want to leave the door open all the time while I played. The solution was simple, a small cooling system. Now because I didn't want to turn it on and off every time I played I devised a simple circuit, a USB powered fan system that used a NO/NC (normally open/ normally closed) or SP/DT switch, a resistor, one PC cooling fan, some LED's, and a USB cord. Why USB you might ask? Simple, when the system turns on the fan or LED's will also, thus the only button I have to press to turn the system on is the power button on the 360. So let's get started!
Step 1: Materials and Tools
Note: The amount of each component is in the [#]. Most of these parts can be bought at your local Radio Shack or The Source (by Circuit City). As for the fan I suggest you find an old computer and rip one out of there as it would be cheaper than buying one for $10. Overall this project should cost about $10 to $20 depending on weather your able to salvage some of the parts.
-PC cooling fan, must run on 5 volts, any size 
-39 Ohms +/-5% Resistor (Orange, White, Black, Gold) 
-NO/NC (SP/DT) Switch 
-USB Cord 
-Hole Saw (optional)
-Screws and Screw Driver (optional)
The reason for the "(optional)" is because there are many ways you can build this project, chose the way that works best for you.