The library allowing to control LEGO mindstorms from OCaml has moved to OCamlForge. You can see some robots build with this at http://ocaml-mindstorm.forge.ocamlcore.org/users.html and videos at http://www.youtube.com/watch?v=Q56vuWgLulA and
http://www.youtube.com/watch?v=ZDlFVQSkmbE
Enjoy!