Skype just released an update allowing the iDevices running the iPhone OS to make calls overe 3G.
I just tried it with the iPad over WiFi and 3G. I also tried with the iPhone over WiFi.
For the time, I think I am happy with this ability. The quality was par but if you move around with the iPad, the quality degrades for so reason.
I hope Skype will make some adjustments for the 3G calls. I know a lot of people who are counting on Apple and Skype to pry them from the clutches of the wireless providers.
-- Post From My iPad