Ooma -- buy hardware, get free P2P VoIP

Free telephone service in the U.S., provided you have broadband internet and can shell out for the hub.
I think the idea is that for those who choose to keep their regular phone line (not required except for 911), the Ooma network uses those lines to terminate calls in the same area, within 12 miles. This is the main cost-saving measure. Money is made from hardware sales and value added services, like individual ringtones.