UK-based VoIP provider Truphone demonstrated last night how Voip works with an iPhone.
They placed a VoIP call from an Apple iPhone, as well as some Facebook integration.

Jim
iPhone Forum

T-Mobile launched the iPhone in Germany at Friday, November/9. and sold the very first day 10,000 iPhones.

This is a very good result.

The iPhone cost in Germany 49,- , 69,- or 89,- EUR for a 2 year contract depending of the plan you coose.

Apple iPhone
Voip Services
Voip Review