I think this is a few years old, but a few previous posts have some interesting discussion http://news.ycombinator.com/item?id=1539783 http://news.ycombinator.

I think this is a few years old, but a few previous posts have some interesting discussion http://news.ycombinator.com/item?id=1539783 http://news.ycombinator.com/item?id=1539783 http://news.ycombinator.com/item?id=825015 http://news.ycombinator.com/item?id=825015 http://news.ycombinator.com/item?id=294455 http://news.ycombinator.com/item?id=294455