My thoughts about which bindings for Qt should be

./xml            --- binding generator from XML input
./moc            --- helper utility which reads input API and creates C++ class which calls proper OCaml functions.
./simple_signals --- hand-written bindings (only proof-of-concept)
./test_gen       --- environment for compiling bindings for QtGUI from generated code
./xmltool        --- a tool for simplifying XML api (just filters root tags by their names)

You can use build.ml script for pseudo-autobuidld.

aaa.xml is XML API representation of QtCore and QtGui namespaces in Qt 4.7.3 (Debian testing).

You can download and compile lablqt automatically (if all depends are installed) using script:

    #!/bin/sh
    #getting git-readonly
    git clone git://github.com/Kakadu/lablqt.git
    cd lablqt
    ocaml build.ml