As a follow up to this post, I looked at 13 months from 2007 and it looks like either verizon's $1/day of use + .10 a minute or t-mobiles .10 a minute would do me equally well ($100/year, anything else expires too quickly to be economical.) So I should definately switch off my plan. The big question is:
1) keep my phone, but loose my phone number
2) change my phone to a blitz, but keep my number and get web browsing
I wish I had a way to play with the bliz before committing. Switch to the blitz would also be about $120 more (one time charge) for the phone and Verizon activation fee.