[Haskell-cafe] Ocaml for Haskellers tutorial

As a Haskeller who is forced to switch to Ocaml by the job market (or at least by the job interview market), I could really use a "Ocaml for Haskellers" tutorial. I was wondering if there are others who have been in this situation recently and can share a few pointers, or better yet, write a blog entry pointing to good sources of information and highlighting the pitfalls. For instance, I have heard that Ocaml is only fast when one uses loops instead of folds, but I wonder if this is an overstatement. Of course due to the strict semantics of Ocaml many of the assumptions that come from laziness will no longer be valid, but I wonder how different is idiomatic Ocaml from idiomatic Haskell in real world. Thanks, pepe