Here is a little example, whose source is here. Many other examples on that page.
And, of course, the code of ocamlweb it-self, in formats PostScript and HTML.
You can access the FTP zone directly. Here are the recent changes.
Thanks to Judicaël Courant, Ralf Treinen, Patrick Loiseleur, Pierre Courtieu, François Pottier, Christian Rinderknecht, Anne Dorland and Guillaume Muller for their help.