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Nothing is working. In fact, everything we do only seems to hurt us.
Scuba addict - yes that's what I'm seeing. Site's with a certain degree of link authority appear to be escaping the pandas claws (even if they break many of the panda "rules" - thin content, scraped content from manufacturer sites, etc...)
Sgt_Kickaxe sums things up beautifully. Sgt_Kickaxe has a successful site, luckily untouched by Panda - but is now AFRAID to do anything AT ALL to his website or he may be forsaken by google never to return.
From my experience:
1) For now, only site pandalyzed for duplicate content regained their traffic, once duplicated content removed.
2) Deleting thin/shallow pages reduce even more the traffic. But it is useful for the future.
3) A site will have the penalty dropped only once a lot of good page were added.
Explanation: Google want not play a cat and mouse game with webmasters. Only a high involvement in the site will produce a visible result.