Also, this blog post (which did the rounds on HN a while back) was excellent for understanding it: http://funcall.blogspot.com/2009/04/you-knew-id-say-somethin

Also, this blog post (which did the rounds on HN a while back) was excellent for understanding it: http://funcall.blogspot.com/2009/04/you-knew-id-say-something.html http://funcall.blogspot.com/2009/04/you-knew-id-say-somethin... (It's part of a 5 part series... but you don't have to necessarily read all of them... it kind of wanders.)