I just added (in the right sidebar, under the top 10 topbits) the very handsome 'open music search' box, made by David Holmes with a little help from Google Co-op.
With this box you can find Copyleft, Creative Commons, Open Source, and Public Domain media, software, news and services. To see if it fits your needs, put as an example 'bswc' in the box, and click 'search'.
You can also put this search box to your website for finding legal, free and podsafe music resources. Grab the code here.