Is there a program out there that I can use to take a .jpg and print it out so that it will be the same size as a CD booklet? Either that or what is the size (800 x 600 as an example) of the size ...

You can do a lot of neat things with iTunes beyond organizing and playing music. Brian Tong at CNET demonstrates how to create and print custom, mosaic-style covers for My Awesome Mix CD.