One nice thing about voip is that I can use a voip softphone client and load that into my Dell Axim PDA. I then can use my Dell Axim or laptop like a cell phone. Then when I travel anywhere in North America the cost is no different if I was calling here in Toronto or NY or LA. It costs all the same as long as I can get a network connection.
http://www.vonage.com/features.php?feature=softphone


http://www.quadloft.com/hometheater- new HT