Content_ed - 9:36 pm on Apr 11, 2011 (gmt 0)
Amusingly, yesterday I made the first changes to our impacted sites - didn't know Google's schedule. Nothing major though, strictly eliminating some navigation duplication in case they've decided internal links are spammy. Hasn't indexed yet, was tempted to undo the changes, but decided "screw it."
But I wanted to comment that although my sites were severely impacted by Panda, the penalty was unlike any of the minus X penalties I read about here. It was more like a loss of a few positions on most phrases, and when you have a lot of #1 phrases, losing a few positions is 50% down.