This is the official web page of the OCaml development team. Here you'll find the official distribution, the manual, archives of the mailing list, links to tutorials and contributed libraries (in "The Humps"), style guidelines, books about OCaml.
By Emmanuel Chailloux, Pascal Manoury, Bruno Pagano; O'Reilly, 2005. Book online. Many topics and examples covered. One drawback: based on old OCaml version. HTML, PDF.