This article is from the Piano General Topics FAQ, by Isako Hoshino firstname.lastname@example.org with numerous contributions by others.
Scott D. Reeves, "Creative Jazz Improvisation"
A very thorough book on the application of various scales,
modes, and techniques to jazz chord progressions, and it's
chock full of exercises to boot.
Mark Levine, "The Jazz Piano Book," Chuck Sher Publishing
This book will give you a nice complete introduction to
scale theory, and it contains information on chord voicing
and how to approach different progressions.
Mark Levine, "The Jazz Theory Book," Chuch Sher Publishing
Stephen Nachmanovich, "Free Play: Creativity in Life
and in the Arts."
This book covers improvisation, creativity in jazz playing