Oh, a few more; sorry:

Will TeleNav work with the iPhone plan? Or does it require the BB plan(s)?

AIM application from BB also requires a BB plan, or does it run through data?

Are there any email applications that don't use the BB servers that are comparable (will need to install one, right?)

The BB is not going to be my primary phone, but would like to maximize its features as much as possible.

Thanks again!