Skype
Skype - free global telephony via peer-to-peer software. More at http://www.skype.com
The Register: The Web never stands still, although Skype has some way to go to reach the 250 million KaZaA downloads. Does this mean that half a million kids have started their own telephone network without asking anyone?
Sounds like it. What if everyone using a P2P network could talk to everyone else on such a network for free? The revenue reduction that has hit music labels will begin to have the same annually deterioratingeffect on telcos."
... "There are both technical and political difficulties in attaching this network to normal wired telephones, but if this is ever overcome, Skype has the potential to become the world's next phone network, hijacked by the young."