I don't know if this plug in will work on the Windows version of Safari, but Inquisitor (inquisitorx.com) is one of the best plug-ins ever both in terms of look and functionality, and is the only thing that makes me ever use Safari over FF on my G4.
I'll be happy to apply, but I'm sure I'm not what they're looking for in a beta tester under a NDA. Maybe Kim would have more luck. (Maybe LISE would have more luck!) Hopefully this means that they plan to FINALLY have this ready by Christmas.