I thought the same as you disneysteve. I was under the impression it was tied to how you filed your taxes...
Economic stimulus payments will be issued according to the last two-digits of the main filer's Social Security number. For joint filers, the payments will go out based on the person listed first on the return. Payments will be made by either direct deposit or paper check, consistent with how people filed their 2007 tax return.
People who use direct deposit also will be among the first to receive the payments starting April 28. Direct deposits will be made daily and completed by the date listed below:
Stimulus Payment Schedule for Tax Returns Processed by April 15