This is a little off topic perhaps, but I just discovered that the CCK can be used to import photos from a CF card.
I have a camera that uses the older, larger-sized Compact Flash cards. I tried connecting the camera's USB cable to the iPad via the CCK; no dice. The iOS message was that this device was not supported (not the "device uses too much power" message I get when trying other USB devices).
Then I remembered I had a CF card reader stowed away and thought I'd try it through the CCK. Success! It took a minute or so for them all to show up, but eventually every one of the hundreds of photos on the card showed up on the preview/import screen.
The short of it is that SD cards aren't the only kind of flash memory you can use, but CF cards too--via an appropriate card reader plugged into the USB connector in the CCK. I don't suppose I'm the first to discover this? Now to see if my USB memory stick will work...
If this is too far OT for this thread, I beg the indulgence of the moderators and ask that it be moved to a more appropriate thread...