Shatner - 7:59 am on May 29, 2011 (gmt 0)
I don't understand why it matters. Most of the confusion going on with Google right now has nothing to do with manual corrections.
That said, I know several people who after Panda 1.0 had their rankings restored by a manual correction. But no one after Panda 2.0, so if this is true it could have been something instituted after Panda 2.0.