I've been working hard on beating Panda 1 for about 1 1/3 years now, I got a bump in May (12') but it just brought back long tails. I have a few hundred thin pages yet to clean. But seeing as I already cleaned 17,000 pages thus far, I figured I would see more of a boost.
I took your advice about Rich Snippets and Tieing my G+ account to my pages. I just put that in motion on Sunday, probably not quick enough for Panda to have ate up a full crawl.
I consulted with @RustyBrick on this. Barry seems convinced that everything has to be clean before you break through. So I just have to keep working away.
One thing is for sure, my site is much better for users now.