Thought this was an interesting article.
http://www.facebook.com/l.php?u=http://ow.ly/9QgiD&h=YAQENKcm6AQERc01VV4QaebDDVjgmygOu93-bfFUwthkt_w
http://www.facebook.com/l.php?u=http://ow.ly/9QgiD&h=YAQENKcm6AQERc01VV4QaebDDVjgmygOu93-bfFUwthkt_w