GlennO
Axe-Master
The Guitar Tricks site has song lessons, where an instructor shows you how to play the song. Accompanying the lesson is the backing track. While you can't download the backing track (the licensing fees for that would be prohibitive), you can play the backing track and record that playback. The backing tracks have versions with and without the guitar. They really do a great job on their backing tracks, with top-notch musicians and producers.