you say you want a revolution ?
I've been thinking, apropos of nothing here, the big deal about VoIP is not cheap calling. We already have that in abundance. It's tax avoidance (and yes that's a worthy goal, when the tax is punitive and used to prop up inefficient economic development models from our 19th century agrarian past.) If you're like me, the tax portion of your monthly phone bill is five times or more greater than what you spend on LD over the same interval.
So, at home we've been experimenting with Skype, and liking the quality of service a lot. But the headset/desktop interface (as a requirement today) is a total bummer. It has to date dramatically curtailed the network effects I expect to see from tools like this. Developments on several different fronts simultaneously, however, indicate that those days are about to change real soon.
Three cheers for popular representation!