I've been teaching myself some of the jazz ideas lately after Alan Holdsworth gave me that 'How in God's name does he do that?' feeling. No i'm not on about his fast playing, his scales defeat my completely when I try and figure out how he changes from one to the next and over what chords. one site I found in my search was http://www.jazzguitar.com that has some interseting beginner-lessons for jazz, although it helps if you know your theory.