Smooth Jazz Solos
Three short solos, increasingly difficult. The backing is quite simple and the only scales you need are C major and F Dorian (and chromatic to your own taste). Try to play by ear as much as you can, and when you can't, check the TABS/notation.
View the notation/TAB
level #1
level #2
level #3
Update: the TABS were posted long ago, but unfortunately are no longer available. Sorry about that!
Learn to improvise
Learn to improvise with the Jazz Exercises: From basic exercises to full solos, with backing tracks, midi files, TABS and notation, and a guide with explanations and study advice. Also check out the Smooth Jazz Refill and All Jazz Refill.