iPhone Photo Printer
This printer($60) that prints 4×6 photos directly from a docked iPhone or iPod touch.
"Requiring no computer or software, the printer is controlled from your iPhone via a free downloadable app. In less than a minute and without ink cartridges, it prints crystal-clear 300 dpi resolution pictures with vibrant colors, thanks to patented paper embedded with yellow, magenta, and cyan dye crystals."
I don't really like it, but it is still a good idea.