i accidentally formatted the wrong hard drive once, but i was able to retrieve most data on it by using O&O Format Recovery. however i didn't touch the HD upon formatting because writing over the files can make them irrecoverable.
as espire says try the DC, although i haven't tried it myself. i got most of my stuff from their
HQ video download thread but i think many of them are expired links now. it would'nt hurt to try.