Today, I see that Vonage has plans to ship a WiFi phone, and the traveller in me is drooling. With such a phone, all I will need is a wifi connection to make and receive local calls to North America, and I won't need to drag a laptop and headset and pay fees on Skype to call landlines. Awesome.
I wonder, though, how it will handle authentication on a T-Mobile Hotspot / Starbucks-type service. The phone Vonage will distribute is made by UTStarcom, and their F1000 wifi phone spec sheet makes no mention of a browser, which is necessary to input a username and password. As a potential customer, I'm hoping they've thought through the common use cases for the phone ("I want to use this phone at Starbucks").
Still, Vonage is headed in the right direction. I can't imagine that the folks at T-Mobile are thrilled about Vonage using its own broadband network to disrupt T-Mobile's mobile business. The effect likely won't be felt initially, but wifi ubiquity is growing, VOIP is doing nothing if not disrupting traditional phone service.