Need a Google Voice app for Mac
Solution 1:
The developer's twitter page said that Google has revoked access to Google Voice for GrowlVoice so they can no longer support the app. It has since been removed from the App Store as well and I am also looking for an alternative to this wonderful application.
Solution 2:
Check the Twitter feed for the developer. As of nine hours ago GrowlVoice access to Google Voice has been shutdown and will not be corrected.