I started ranking for a few nice keywords tonight too. Of course as everyone knows, I removed my adsense too. That much is on the record.
As this trend picks up, watch Google say that Adsense has nothing to do with it :)
My recovery is very partial, although tonight was much stronger. I can't say what will happen, but obviously I hope it improves, or at least doesn't go down. It has beena very painful two months. It hit me hard and all of the sudden.
Matt Cutts was saying just last year not to worry much about dupe pages and then they say you are hit because of them and the ads.
What we would typically recommend is to just go ahead and let the Googlebot crawl those pages and then de-duplicate them on our end. Or, if you have the ability, you can use site architecture to fix any duplication issues in advance. If your site is 50 percent KML files or you have a disproportionately large number of fonts and you really don't want any of them crawled, you can certainly use robots.txt. Robots.txt does allow a wildcard within individual directives, so you can block them. For most sites that are typically almost all HTML with just a few additional pages or different additional file types, I would recommend letting Googlebot crawl those.
Same with adsense.
Edit: I hope this isn't the boost before the Panda 3 slap, the SERPS are very fluid. But it will be two months this week so maybe Goog came to its senses