More-or-less for my own amusement, I've written a small Python package
that allows one to write Python callables in PowerPC assembly:
http://starship.python.net/crew/mwh/hacks/PPY.html
This is clearly an insane thing to want to do, but take a look if it
sounds intriguing. Currently only supports Mac OS X but I imagine a
port to linux/ppc would be fairly straightforward.
Cheers,
mwh