EV-DO Card

This weekend I badly missed my old EV-DO connection. I’ve pretty well decided that I need to bite the bullet and get an EV-DO card. I don’t have a lot of monthly business expenses, and getting stuck without an internet connection is a big problem for a one-man shop.

The question now is how best to set up the service. Oh how I wish I could pay a daily usage fee…

If I buy a card without a plan, I believe I could activate and deactivate service as desired without major penalty. Each activation might have a fee associated with it, has anyone tried this? Tips/pitfalls?