1. No, VZW will not activate a smartphone without a data plan.
2. Probably a $30 data plan (BIS for the BlackBerry). VZW now offers a $30 plan for WinMo devices, bugt I'm not sure if teh Q is eligible.
3. The data plans are either $30 or $45 for each device. WinMo devices can use a pay-as-you-go plan, but it's not economical at all.
4. The BlackBerry will go a full day without charging the battery--the Q will not. Of course, YMMV.

They're completely different devices--hard to compare. Overall, they have very similar features and will share similar functionality.