I lost some photos when my camera jammed on the last day of my vacation. Did a little research and discovered PhotoRec (mac download), a command line utility to recover images and other media off corrupt memory card or disk drives for FREE.

Every other recovery app wants to hijack your data and charge you from $40-80 or more to recover it. Gotta love open source. Kudos to this guy Christophe Grenier who wrote it.

http://download.cnet.com/TestDisk-and-PhotoRec/3000-2248_4-10511775.html (available for all platforms, not just Mac)