this has come up here before. see http://news.ycombinator.com/item?id=174101 http://news.ycombinator.com/item?id=174101 http://news.ycombinator.com/item?id=106

this has come up here before. see http://news.ycombinator.com/item?id=174101 http://news.ycombinator.com/item?id=174101 http://news.ycombinator.com/item?id=1067423 http://news.ycombinator.com/item?id=1067423