I just posted 160 60 second instrumental soundtracks on my site. They are all free, royalty-free, and downloadable. Generally, they're pop/rock/alternative/electronica. Use them forever without recurring fees.
The free downloadable soundtracks are 128Kbps music files, so they should be adequate for some applications/videos/presentations/podcasts (Obviously higher resolution versions [16bit/24bit] are available for a nominal charge--I figured the free ones would be of the most interest...)