PUBLIC MARKS from svartling with tag seo

It seems like google has purged many scraper sites from the google serps, as per this thread: http://www.webmasterworld.com/forum30/30530-2-10.htm I'm sure many people, including myself are very, very pleased about this as it stops scumbag sites from stealing our content. However, it also appears that some non-scraper sites have been included in this purge (including my own). My site has been active for 5 years and is based on unique content. Has anyone else been effected by this, and does google intend to refine the algorithm to stop valid, unique content sites from falling victim?