Randomchord.com

A web-based utility that combines mp3 backing tracks, chord/scale information, and an optional randomizer to choose a chord for you. Chord types covered include standard major, minor and dominant 7ths, as well as #11, alt, sus and min/maj sounds.

This is the website for anyone who has every felt that their playing is stuck in a rut because they always seem to end up practicing the same old chords, or has a particular chord type they want to work on, or who wants to learn a few more harmonic tricks to keep their soloing fresh.