The ocamlweb project announced at last year's OCaml User's Meeting can serve this purpose. Please see the master repo here [1] and the live site here [2]*. We welcome and need the community to add more content. We've attempted to make contributing easier. You just checkout a git project, add simple html, and submit a pull request. This is perhaps not as nice as a wiki, but it let's us scale up to other features that wikis are not suitable for.

If you need help getting a larger section started, such as on the topic of this thread, just email me or the mailing list [3].

[1] https://github.com/agarwal/ocamlweb

[2] http://www.ocaml-lang.org/

[3] https://lists.forge.ocamlcore.org/cgi-bin/listinfo/ocamlweb-devel

* Note the live site is behind the master repo as we have some cleaning up yet to do in the master branch.