A third (more-than-) possible solution: google("python snowball"); the first page of results has at least 3 hits referring to Python wrappers for Snowball.
There are quite a few wrappers for the C-compiled snowball stemmers, but I'm looking for a pure-Python solution. It doesn't seem like there is such a thing, but I figured I'd take a shot here before I think about doing it myself :/
Matt -- http://mail.python.org/mailman/listinfo/python-list