When I talked to a representative on the phone about pre-ordering the Droid INC. (this was probably 7:30pm+ est.). I basically was put on a list and she would call me the day before it shipped (4/28) to process my order. I wasn't billed anything, she said I will pay when she calls me back. She also gave me her personal email at VZW with all her contact info if i feel the need to change something or need help with anything.
I have an Alltel plan so I guess since I couldn't order directly through the website because of plan issues. This is how they do it for Alltel customers.