I recently tried Internet telephony for the first time with Speak Freely. Worked like a charme (from Windows to Windows, in our case). Unfortunately, Speak Freely will be discontinued. As Walker writes, the Intenet is a different place now than it was when he wrote Speak Freely. One problem being that many machines on the Internet sit behind NATs. Who would really know how to work around that? Well, somebody like the KaZaA guys. So they did, with Skype.