I just recently went from a corporate sponsored blackberry to getting my own personal blackberry. I changed jobs and my new employer uses the Treo over the Blackberry... *shudder*.

Anyway, the "unlimited data plan" from Verizon limits you to 5GB per month. I think it would be rather difficult to exceed 5GB per month unless you were using it as a modem for your computer or laptop. In that case, they are very specific about what you can and can't do when it comes to p2p and streaming media. Verizon Plan