Just watched Jimmy Bruno's No Nonsense Jazz Guitar and highly recommend it. He cuts through to the basics in a way a beginner can understand and a more accomplished player can appreciate. Something I see with a lot of players trying to get a grip on playing jazz is the feeling they need to know a million scales and chords before they really know how to use very basic diatonic and melodic minor harmony. Jimmy demystifies it with clear examples and real down to earth delivery. And he'll scare the crap outta you with his total mastery of what he's talking about. His fingering concept for scales is also very applicable to the bass guitar. It was a bit of a revelation to be reminded by a truly phenomenal player that music is not that complicated and there aren't any problems 8 or 10 hours of practice a day won't solve.