Found another site today with a fairly wide selection of some pretty good free royalty free music clips here:
http://www.mattmcfarland.com/index.php/alltracks.html

Matt’s usage terms are pretty straight-forward:

Here you can find some of my favorites, which are all royalty free! The only thing I ask is that you kindly mention my name and website in your product. If you have any more questions please ask!

You can also find lots of free royalty free music on our site at
Free Royalty Free Music Loops and Full Length Tracks