Well, I liked the article - I have worked through the real world haskell book just enough to sort-of understand this article :-)

That said, I gave up on Haskell. I spend a lot of time semi-learning languages because it is fun. But, for practicality, I really concentrate on knowing just Ruby, Common Lisp, and Java very well.

Striking a good balance between practicality and having fun is not so easy to do.