www.ocremix.org
So this site is comprised of remix's of video game music.
Now don't mistake this as some crappy site with people who think they are good.
I've never heard a bad song on here. The artists have some serious talent.
Here's my current favorite:
http://www.ocremix.org/remix/OCR00690/
To download the songs, just click the download tab, and select a link.