[rolfea]

Mark Levine's book is a great resource and the way he presents much of the theory behind jazz improvisation and actually ties it to practice is very useful.

Regarding ear training - I think it's worth mentioning that learning to identify intervals in isolation won't have major returns on investment unless you're main goal is to transcribe by ear 20th century music that is divorced from "common practice" harmonic approaches.

Instead, I'd recommend taking an approach of build up aural comprehension of harmonic idioms from whatever style of music you're interested in learning about - so for classical music, recognizing the difference between tonic and dominant and when we've moved from one to the other is more valuable (and easier) than knowing whether the soprano voice in an chord moved a third or a second.