All great advice. Another thing to remember is, don't be afraid to break the rules for the sake of being interesting. As you surely know, jazz is primarily about spontaneity, and in this way theoretical structures are a two-edged sword: they can give direction to your improvisatory playing, but they can also box it in. I'm not saying you should forget all your scales and modes and just mash up the fretboard (like I do :o), but if you find yourself sounding predictable, try putting the rules out of your mind, if only for one or two phrases, just to restore interest. Throw in some unusual intervals and double stops, inverted arpeggios or accidentals, not minding for a moment whether they are theory-kosher. If you do this kind of thing strategically, you can bring a whole new level of expression into your improvising that will contrast with the more melodic side of your style. Don't let it replace it completely, though, unless you want to sound like Derek Bailey! :eek: :D

Hope all that rubbish was able to help some. Sorry if I was just telling you things that you already know.