Dark Side of the Moon arranged for the NES

It's a chiptune media sharing/community site. Very clean design and everything on there is Creative Commons licensed (so you can use stuff from there in your non-commercial podcasts, videos, presentations, and so on). There are some really good tracks on there too (and some crap, naturally).

If you like it, you could also check out 8bit Weezer: http://www.ptesquad.com/more/pte018.html

And for NES specifically check out The Advantage Band. Two guitars, bass, and drums covering NES songs perfectly. They released two albums on 5RC and toured a few times but they haven't been active for a couple years. Here's a little Contra "Alien's Lair & Boss Music":

http://www.youtube.com/watch?v=aKBtcto6ebI

I think I might be pining for the Moog Cookbook: http://www.youtube.com/watch?v=RJwKaGaSAjE

Edit: How could I forget, The Dub Side of the Moon: http://www.youtube.com/watch?v=ZaR4fsUeTVY

I guess that's progress for you :)