Growl 1.2b1 is Available with Snow Leopard Support
OK, they have been working on it, and it's not a release, but a beta of Growl for Snow Leopard - 1.2b1 is available from the Google Code site for Growl. I'm not sure I'm going to grab it yet - I still have time before I need it as I won't be able to get to the update for another few days, but it's nice to know it's there should I find the time sooner than I expect.