Sounds alot like this:
http://www.playpianonow.com/ I purchased this:
http://www.scotthouston.com/index.html I also purchased this:
http://users.wireweb.net/green/pianolessons.htm Scott "the piano guy" Houston teaches these chord playing techniques, he starts off with chords in the left hand, but then suggests alternating the 1st and 5th, then rolled chords, then two root notes together, etc.
Don't forget these lessons are for PIANO not keyboards. IMO you dont play the keyboard the same as a PIANO. Real Piano players do not hammer down chords with the left hand.
I accidentally learned to play the melody by ear because I had the chords, but not the melody line. The melody line was in my head. I would think this would word equally as well to learn chords. Try playing songs without the chords in front of you. If you can't figure it out, check it, then hide the chords again. I got to try this myself.
Starkeeper
[This message has been edited by Starkeeper (edited 10-19-2005).]