Victor1 - 6:50 pm on Jun 13, 2010 (gmt 0)
I was hit hard as well with all the sites I seod and want to reverse it as well.
Over the years I have found what worked and just repeated it over and over - I thought it was straight forward white hat SEO but something is upsetting the search engine now. Some combination of something>
I am looking into incoming link diversity and also into re-thining of use of keywords. Eg. Top of Silo keywords, or root keywords more to rank for long tail.