I ran across this site that has a list of free music tracks available for download to use in your commercial projects:

Free Music Tracks

Pretty cool stuff.

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You can also get free royalty free music on our Partners In Rhyme free music loops page here:

Free Music Loops

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One of our visitors mentioned our free music loops page in his blog here
Caddickisms
He also has links to other sources for free music and describes his experiences in using the different formats and types of free music.
Very enlightening.

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Partners In Rhyme is now actively looking for sound designers who have catalogs of sound effects that they would like to distribute through our network of websites.
We have been working very hard for last year on our www.sound-effect.com site and it is now working really well and has been moved to a new faster server due to the traffic load it has been receiving.
We have uploaded 5000 sound effects into the database and would like to hear from any sound designers who might be interested in contributing.
We offer a 60/40 (in favor of the contributor) non-exclusive deal.
Please contact me via the www.sound-effect.com contact page if you are interested.