I've been using Skype for a year or so, and am pretty happy with the service. When calling PC-to-PC, it's great. When calling PC-to-phone, the international rates are excellent. The quality is not quite as high as regular land lines, and it sounds a little like half-duplex in that only one person can talk at a time. But at the rates Skype charges (or "charge", as our UK friends would say), one can't complain. And I'll confirm Steve's observation that PC-to-phone calls are now free within the US and Canada. Good service, good price.