If you're regaulr NPR listener, you might have caught this broadcast already. If you didn't then check it out. Gabriela Montero, a protege of Marta Agerich, has a cd coming out called "Bach and Beyond" which offers up some truly inventive and delicious jazzy improvisations on the classics.
You can hear it here. Her webiste (see above link) has both audio clips and a podcast.