Information Week has a cover story on "Voice over IP [Internet Protocol]" phone systems, which delivers the message that initially-skeptical early adopters of this new way to handle your phone infrastructure are the strongest evangelizers of all, with "Cost of Ownership" rated superior for VoIP by a margin of 70% - 18% over your conventional phone service, "Advanced Features" by a margin of 68% - 8%, "User Satisfaction" by a margin of 28% - 18%, BUT "Quality of Service" lagging by 14% - 30%."
But clearly the wave of the future. If you haven't already, sell your AT&T.