The Top 10 Guitar Sites In Over 20 Different Categories

http://www.wholenote.com Loads of great content here all about chords. In addition to the Chord Finder tool, which allows you to select a root, and then the variation, get to the chords and positions, and to hear them being played, there’s also plenty of other chord stuff.

There’s everything from Chord theory chart, chord/scale relationships, Fingerboard diagram, Circle of 5ths, Scale Theory and Arpeggio theory charts.

Definitely worth spending a bit of time here.