As I mentioned earlier, I recently presented to the Piano Pedagogy Group. The piano teachers in this group are currently working on their Grade 10 or their Piano Pedagogy certification through Royal Conservatory of Music, Conservatory Canada or London College of Music . They are all classically trained (translation: improvisation, lead sheets and chord charts are scary).
This is a list of the "How To" books that I use whenever I teach and play contemporary music (e.g. pop, rock, Latin, jazz, ragtime) that I shared with them:
Conservatory Canada Contemporary Idioms Syllabus
||Volume 3 - The II/V7/I Progression
By Jamey Aebersold. For any C, Eb, Bb, bass instrument or voice. Play-Along series with accompaniment CD. Jamey Aebersold Play-A-Long series. Beginner, intermediate. Book & CD. 100 pages. Published by Jamey Aebersold Jazz (JA.V03DS)
There are a few more in my "To Check Out" pile. I'll add them once I've had a chance to go through them a bit.