Only one of my sites was hit on Feb 24th but it lost 80% of its traffic and went from like position 12 to being completely out of the index for a highly searched term. Today it is back. I deleted a lot of thin content that other people had scraped off of my site. I also deleted all my YouTube videos, and made some fresh content with links back to my site in it so when is scraped it might still link back. Also I just set up pubsubhub and a Twitter auto poster so every time I make a new post it broadcasts it to the stupid Googlebot.