I'm wrapping Box2D with Boost.Python, just for fun. Far from mirroring the C++
interface, my plan is to add hefty swoudjes of functionality in python (like merging
bodies, automatic gear ratio calculation, helpers for chains, ui for building bodies,
gametastic goodness?

).
It's rudimentary at this point, but there is a sandbox sample app with a mouse joint.
Beware: This software may not make the slightest bit of sense.
git clone
git://github.com/blak3mill3r/pybox2d.gitsend me an email if you like: blak3mill3r&gmail^com
I've heard unconfirmed rumors that Boost.Python extensions perform significantly
better than their SWIGgy sisters.
(I am not knocking SWIG, for SWIG is very cool)
http://osdir.com/ml/programming.swig/20 ... 00086.html