Optimizing OCaml global illumination rendering code (MiniLight) by Mauricio Fernández.
eigenclass.org
eigenclass.org
(I can only dream about the terror of writing trading software that's on one side of 3% of all trades on the stock exchange.)
http://ocaml.janestreet.com/?q=node/27
And did so only recently. Imagine how bad a standard library has to be before a shop takes it upon themselves to rewrite it. I think that might partly explain why many people have dabbled in Ocaml but few have really embraced it.