Submitted lots of times. Here are a few:

http://news.ycombinator.com/item?id=2156163

http://news.ycombinator.com/item?id=2157322

http://news.ycombinator.com/item?id=2159550

http://news.ycombinator.com/item?id=2161867

http://news.ycombinator.com/item?id=2163105