How about a disc with a file full of baby pictures that he could load onto his work computer (if he has a work computer) to save as a screensaver? Or a CD slideshow set to music of all of the best baby pictures you've taken so far that he could play on your computer or in a dvd player?
Have a professional picture taken of you and baby, frame it in a nice frame, and let him take that to work. Picture People and Sears both offer same day pictures, but Sears charges extra for that.
(Can you see I'm obessed with pictures?? LOL)
I'm not sure what they cost, but there are also digital picture frames out there that allow you to have several pictures rotating in the same frame. (Anyone want to give this to
my hubby as a birthday gift idea?

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Does he wear hats? A friend bought her hubby a "World's Best Dad" baseball cap, and put the baby's footprints on the bill.