Intro:
http://www.ocaml-tutorial.org/

Gutes Buch:
http://www.ffconsultancy.com/products/ocaml_for_scientists/chapter1.pdf

Repository:
http://caml.inria.fr//cgi-bin/hump.en.cgi

Reference:
http://caml.inria.fr/pub/docs/manual-ocaml/index.html

Oreilly:
http://caml.inria.fr/pub/docs/oreilly-book/index.html

Tutorial:
http://caml.inria.fr/pub/docs/u3-ocaml/index.html