Couldn't find anything at Sourceforge.. but there are a couple around.. this is free but they want to sell "larger" version..

http://www.datanumen.com/apsr/

This one is free..

http://www.softpedia.com/get/Multimedia/Graphic/Graphic-Plugins/Photoshop-file--PSD--Extract-Recover-tool.shtml

This one says it's free

http://www.brothersoft.com/psd-recovery-free-481479.html

One thing.. DO make a copy of the corrupted file and store it somewhere.. make SURE it's the same.. check the size, that's usually a reasonable way... conversely, you can use the copied one and leave the original as-is, while you make SURE it hasn't corrupted further. Also, if you don't mind flattened.. try renaming the copy as a tiff istead of psd.. sometimes, that will work. Lou..... still looking, though, lol.

"..... and that was when things got interestiing."