I've just compiled 0.9.7 for myself on OS 10.3.9 on a G4 Powerbook. It
passes all the tests in the test directory. If people on this list
want, I'd be happy to tar/bzip it up, sign it with my PGP key, and post
it somewhere so you can update the sbcl download page (the current
powerpc binary is 0.9.4).