there are a few things you might try:
Restoration by Brian Kato Does not need installation so it doesn't overwrite anything. The ONLY downside is that after locating all the deleted files you have to recover them one at a time. Time consuming but I haven't seen it fail
PC Inspector File Recovery FREEWARE
Digital Photo Recovery v2.0.3 ($29.00)
Lots of utilities and prices vary
Last night, 03/30/2010, I was uploading image files to my FB account directly from my SD memory card and somehow I had a failure in uploading these images. Just this morning I was flustered because when I try to open the folder where my images were stored somehow the files are not there anymore. However when I check the contents using the properties, it says that something occupies a large portion of the memory card which is just about the same size that my images occupied. I am using a Sandisk SD Memory Card with a 2GB memory capacity. I am using my SD card for my Traveler DV-5000 vidcam. Can I still extract my images? How can extract those images?