Forbes.com: Talking In The Free World

In just ten months, some 60,000 people have subscribed to a service called Free World Dialup that lets you make phone calls free over the Internet. It's pretty simple: You download the FWD software and get a five-digit FWD number. Then, you hook up a microphone and headphones to your PC--and you've turned your PC into a telephone. Your voice gets digitized and sent as packets over the Internet, using voice-over-Internet-Protocol (VoIP) technology.