To learn pyGTK I made gDevilspie : A user friendly interface to the devilspie window matching daemon, to create rules easily.
Project page : http://code.google.com/p/gdevilspie/
Gnomefiles entry : http://gnomefiles.org/app.php/gDevilspie
The devilspie project : http://burtonini.com/blog/computers/devilspie
The devilspie referencde : http://foosel.org/linux/devilspie