I noticed yesterday that I dont rank anywhere for my main keywords, but which did not have that good ranking anyway be cause of Panda. Also several other internal pages has suffered 2-3 pages down the rankings. Im really not sure what has happen, but I also think maybe google has build in a 2-3% shuffle into the rankings so that some sites rank good on pure luck to confuse seos, I think that theory sounds interesting :)
Well re-inclusion or contacting google is out of the question, that just makes things worse, I almost think the best solution is building a new site.