There has been numerous reports off people dropping drastically in rank for not only autoblogs but micro niche sites with unique content with backlinks build to them. This is causing people to lose up to 80% of their income which is a MAJOR drop in earnings. From what I am reading, forum profiles (Xrumer) and blog comments (scrapebox) are the culprit and their value has decreased in Google's eyes. I can't totally confirm this but it does seem the case. The known dates for the Panda #2 is around May 13, 2011. If your rankings dropped around then, you may be affected. Could you please post If you are one of those people affected? If so, were you building quality content or did you syndicate or spin content? Did you have forum profiles and/or blog comments? What was the percentage drop in your statistics and your earnings? The more information we get, the better we can understand what the real cause is and what we can do to try to avoid it. For now, focus on building high quality links and Web 2.0 properties along with article marketing. I have been using AMR for a while and it does give a good boost in SERPs.