In addition to this, another great Haskell+monads learning source is Real World Haskell, whose exercises will have you implement your own monads without telling

In addition to this, another great Haskell+monads learning source is Real World Haskell, whose exercises will have you implement your own monads without telling you, and then reveal the surprise later. Well, it would have been a surprise, but I just spoiled it. Anyway, get reading :)