The Google news alerts are an excellent source of information on all kinds of things. I have two running at the moment; one for VoIP and the other for developments in wi-fi. Some items from the former may interest others:
One wonders if the powerful communications industry in the USA will actually allow this one to happen: "Legislation was unveiled Friday that would classify voice over Internet Protocol as an information service, releasing it from telecommunications regulation." (RCR Wireless News)
I mentioned Skype some time ago: here is a less than totally enthusiastice review from SFGate.com:
Trying it out, I found Skype to be a simple to use service that felt more like an instant messenger program with a strong integrated voice-over-Internet protocol functionality. But it's no substitute for a telephone.
And, finally, a useful account of what's going on from The Mercury News.
There's so much hype and counter-hype that it's difficult to figure out what the future may hold: my guess, FWIW, it that VoIP is on a roll and that the world of telephony is in for a revolution - a technological optimist would probably say two years, a telecomms exec. would probably hope for fifteen before it hits, so eight to ten years is probably a reasonable estimate for the time by which VoIP will have a significant share (say 30%?) of the market.