Google might be ready to take on Skype. Late last year they bought Gizmo5, a company that produced desktop software that allowed for VoIP calls. It’s not clear if the leaked software will be rebranded to Google Voice, but it appeared to integrate (contacts and incoming calls to GV) with the service rather seamlessly. Mike Arrington of Techcrunch tested it out in video and noted good call quality without any echos – that’s always a concern with VoIP. At this point no one knows if this software will see the light of day, but we think it’s pretty likely. Then again Arrington makes a good point. The founders of Google don’t want anything happening outside of the browser window. But then why an iPhone app for Google Voice?