Hi folks:
Go to www.gettyimages.com
Click "editorial" and search for "Jack Benny" - this is a terrific archive of photos, there are 250+ of Jack, most of which I had not seen before, including a lot from the old Time-Life files.
The images have a big watermark on them, you have to pay to get a "clean" copy but some really tremendous photos on there - including the Bennys dining at the Burnses, Jack with Joan and a big monkey on his back (oh, the caption contest possibilities!).