LifeHacker has the middleware to line up Growl notifactions for Google Voice …
Turn Google Voice into a Growl-Friendly Mac App – Google Voice – Lifehacker
Google Voice’s web site is handy, but keeping it open in a browser tab is a pain. Mac users, however, can get Growl notifications, complete with transcript previews, and app badge updates with the handy Fluid app.
Scotsman on a Horse 
Hello.This post was extremely fascinating, especially since I was searching for thoughts on this issue last Friday.