I got some stuff might help- hope it does ;
- - For the left hand, work on accompaniment patterns of many types is very helpful. For example: Stride patterns , walking tenths , broken tenths or walking bass and boogie patterns can all be exercises.
- - Two handed devices would include playing improvised lines two octaves apart in the style of Phineas Newborn or block chords (4 note close voicing in the R.H. with the melody doubled one octave below in the L.H.) in the style of George Shearing.
KEEP IN MIND KEN - No instrument can achieve endless harmonic variation like the piano. For this reason, exploring harmony is a big part of a jazz pianists practice. Many jazz pianists achieve a good part of their personal identity through their harmonic style.
When I find a voicing I like, the first thing I practice is transposing it through all the keys (most often via the circle of 5ths). 3 note voicings like 14 7 ; 1 3 5 ; etc are good for horn guys to know.Also play the voicing in different registers. Through exploration and repetition, and simplicity via Wynton Kelly or Red Garland, I make the voicing part of my vocabulary. Transposition and repetition are the most common ways of knowing the chords cold.
ALSO- Listen to Art Tatum, Hank Jones, or George Shearing; passing chords, tritone substitutions, and chromatic movements.http://piano.about.com/http://www.youtube.com/view_play_list?p=23...p;v=KR8YzpjTcP0http://www.pianolessonsreviews.net/pianolessons/