Although the LCD screens on most cameras are sufficient for reviewing your shots, wouldn't it be even better to be able to check them out on the larger screen of an iPad? You can already do so, but it involves running a USB cable from the camera to the computer (via an adapter), then transferring the photos across. It would be a lot quicker and simpler if you could just slip the camera's memory card into the tablet, but unfortunately iPads don't have built-in card readers. You can, however, buy the next-best thing: a plug-in CF or SD card reader, designed specifically for the iPad.
The two units work with both iPads 1 and 2, and simply plug into the tablets' connector port. The Photos app will then open, and you will be able to see your shots. Both readers also feature a USB port, so you can use them to view photos from flash drives or cameras with internal memory.
They are now available from Photojojo, with the CF Card Reader priced at US$30, the SD Card Reader at $15, or both for $40.
... and for the record, these are not the only card readers made for the iPad. There are other brands out there, including one sold by Apple itself.