Re Verizon’s VCast…that is a feature more for their standard phones, not their smartphones…none of their smartphones can use this feature, as it is assumed that with a smartphone one can access the full internet, not a walled off garden approach to it.

I don’t know much about Cingular’s music store, except that most music stores by carriers seem to be a little lacking in the usability dept. I doubt if the iPhone will want to access Cingular’s music store. More importantly, if I were RIM, I’d want to access the iTunes store.