If you're trying to get that contemporary sound in your playing; if you're rhythmically-challenged (like yours truly); if you play by ear, but want to learn how to read music.....
then I implore you to purchase this book:
Smooth Jazz Piano: The Complete Guide with CD by Mark Harrison
I've just purchased the book (I'm on pg. 30, 31) and it has really helped my understanding of chords and such. It is a wonderful, wonderful book. It puts theory in easy-to-understand language. Please, if you can get it go to Amazon.com and get it.
A BIG shout-out to DanatiMaestro for the suggestion of this book!!
Be Blessed!