What seems inevitable are Skype phones. Free Skype to Skype. Use it for all of your friends and family calls. I bet someone already has a widget that will do this with a walk-around handset phone.
I talk to my brother in the Philippines through Skype. He’s the tech liaison for a major company that deals with networking from the North America to Asia, and I’m a believer in the service. Heck, every Filipino in L.A. uses it to communicate with RP.