In Haskell, iteratees have given way to coroutine-based approaches like conduits and pipes that let you program in a more natural manner.
As soon as one sees `okmij.org` in the link, one can be confident that there's something educational, and probably mind-bending, on the other end. While this may no longer be state of the art (I'm not in a position to judge), I wouldn't be in a hurry to write it off.
And also run through a script that uses different words for everything that you are used to.