There are various ways to back up a camera to an iPod. I have a Belkin "Media Reader for iPod" that claims to work with any iPod that has a docking slot. It can read CF, SD or memory sticks.
There's also the "Apple iPod Camera Connector [M9861]" that will work only with certain combinations of iPod and camera. See the reviews on this page for some comments, both favourable and otherwise...
Amazon.co.uk: Apple iPod Camera Connector [M9861]: Apple: Electronics & Photo
