Someone once quipped about a Haskell library that "You know it's a good library when just reading the manual removes the problem it solves from your life forever." I feel the same way about this article. That's a compliment, in case you were wondering.

The one criticism I would make is that it's long, and I think you could spread this to other sites and enlighten a lot of people if you wrote an abridged version and perhaps illustrated it with silly pictures of cats.