Skype has introduced free calling within US and Canada. I am currently testing both Skype and Gizmo, even bought phone numbers from each service, so people with real phones can call me too 🙂
So far the testing shows that Gizmo still has plenty of space for improvement. Call quality is inconsistent – I got three calls from same land-line phone – all three were different in terms of quality, ranging from horrible to acceptable. Skype’s call quality usually just above that – ranging from acceptable to excellent. However, I haven’t done any tests over modem or cell phone connection (due in next couple of days).
P.S. Don’t forget a nice headset, it helps a great deal!