VoIP Provider Vonage Planning IPO?

SixDimensionalArray writes "The rumor mill is exploding with stories that large voice-over-ip (VoIP) provider Vonage is planning an initial public offering to raise nearly $600 million. This information is interesting coming out not long after Google's recent release of Google Talk, which overs instant messaging/VoIP services PC-to-PC as well as a surge in marketing by VoIP providers such as Covad and Skype. Could this be yet another bubble?"