Stumbled across this awesome 8 bit / chiptune loop pack on freesound.org that was released under the creative commons attribution license. I haven’t gone through all of these yet, but I’ve listened to many of them. There’s all types of cool blips and beeps, rhythmic shots, hits and pulses. Definitely sounds like a useful addition to a loop collection.
Download above or if there’s an issue with that link, use my mirror here http://www.4shared.com/zip/GNi5isFrba/12786__looppacks__8bit-loop-pa.html