Recently, the last two weeks that is, one of my sites that was sitting on page 1 of Google for a keyword with over 20m search results was seoed right off the front page into oblivion. They targeted 3 keywords but only one dropped. They increased my main keyword by about 200 back links all pointing from Chinese websites. One way to possibly find out who it is to look at the top 9 results to see how many of those sites have backlinks coming from these types of web sites. Dont know, was just thinking of revenge. In any case, i was wondering how many of you have recovered from a negative seo situation.