Discussed before: http://news.ycombinator.com/item?id=89669 http://news.ycombinator.com/item?id=89669 http://news.ycombinator.com/item?id=834513 http://news.y

Discussed before: http://news.ycombinator.com/item?id=89669 http://news.ycombinator.com/item?id=89669 http://news.ycombinator.com/item?id=834513 http://news.ycombinator.com/item?id=834513 http://news.ycombinator.com/item?id=835092 http://news.ycombinator.com/item?id=835092 Hope these help.