There's a brand new website that teaches you guitar chords.  It's called Guitar-Chord-Mentor.com.  It's a very young site so it will be fun and interesting to see how it grows.  There's a place on the homepage where you can subscribe for free to  keep up-to-date with any additions or changes to the site.  It has a pretty cool explanation of bar chords, and the music reading section looks like it in time it will be pretty cool too.  Check it out!