I don't think there's any tut for it on this forum. It's pretty straight forward though... Just find a voltage point and a ground, find the right resistor, wire in some leds, glue them where you like them, and boom, a lit HDD! Although I'm not sure about pinouts, if the 360 is anything like the original xbox, you should be able to tap the molex connectors. Correct me if I'm wrong though.