Please take a look and the following products.
These are resources that I personally use and recommend. Click on the links for further information.
Websites
Jazzguitar.be
Check out tons of free jazz guitar resources here as well as an excellent Jazz Guitar and Jazz Guitarists.
Software
Band in a Box
Band-in-a-Box is an intelligent automatic accompaniment music software program for your multimedia computer. You can hear and play along to many song ideas and go from “nothing” to “something” in a very short period of time with Band-in-a-Box as your “on demand” backup band. Band-in-a-Box is a powerful and creative music composition tool for exploring and developing musical ideas with near-instantaneous feedback.
Check it out at PG Music.com