The Mac Museum put together an iPad, a camera connection kit, and a USB CueCat barcode reader, which reads the codes via the CueCat and then creates keyboard events to type out the codes as they are read.
We’re told the solution is completely plug-and-play — no hacking, no jailbreaking required. It should work with programs like Price Grabber, where you normally type in the UPCs manually, and with Numbers — although apparently it doesn’t seem to work with Grocery IQ. Cool stuff. The Mac Museum picked up their USB CueCat for $8.88 buy-it-now with $5.55 shipping on eBay.
Check out the video.