Previous good discussions on this: http://news.ycombinator.com/item?id=1405698 http://news.ycombinator.com/item?id=1405698 http://news.ycombinator.com/item?id

Previous good discussions on this: http://news.ycombinator.com/item?id=1405698 http://news.ycombinator.com/item?id=1405698 http://news.ycombinator.com/item?id=1110283 http://news.ycombinator.com/item?id=1110283