iPhone owners, can you comment on the utility of the device WITHOUT internet access? Can I.... download Google Maps, or some static map content (like all those city guides for Palm)?

As far as I know, cellular data costs $50/month; more than my high speed cable modem. But you mention it's down to $20/month? That's decent, but "pay per meg" would be so much better for me.

I still barely use my Treo 650 ability, so if I'm going to barely use an iPhone, maybe I should keep what I've got.