I just made my sister very happy by recovering lost photos from her last holliday that were still on a flash card but unreadable. If you ever need a tool like this the best one for this job in my experience is PhotoRec. It doesn't have a great user interface, but it works very well and is available on a number of plattforms. If you don't know exactly what option to choose when it asks you something, just pick the default (just be sure to select the right drive to recover from and a folder on your hd to save the recovered images to).
A great tool to recover photos on unreadable or formatted flash cards
November 22, 2009