Bobbie asks what the killer app for 3G is: "video calling hasn't really taken off, so perhaps it will just be about fast download times and interconnectivity".
Hmm, what was the killer app for v32bis? Or for ISDN? Or for ADSL?
IMHO it's not about the networks, it's about getting them plugged into peoples lives. The killer app for the fixed-line internet was web access, because it was so universal and could be applied in so many ways. So err... it's "just" connectivity.