From looking around, I think I could use the Bluetooth headset that I have for my phone with a Bluetooth dongle on my computer to make Skype calls...this could be really cool (or depending on your perspective).
I use Skype. you can find me on there under SaabStory900.
I haven't bought a local number from there yet. Plan on doing it before I start heavy travel to central/south America. I have a friend who is currently in brazil and i call his California number to reach him.