Because I dont know your tax status of 2007, Here is website to tell you some information:
Your payment may be less than the maximum for one or more of the following reasons:
--You are married filing a joint return and your AGI is more than $150,000.
--You owe back taxes.
--You have non-tax federal debts such as unpaid student loans or child-support obligations.
you might as well use IRS Economic Stimulus Payment Calculator to calculate step by step. Here is website:
http://www.irs.gov/app/espc/
Usually they will send you a notice soon to explain how to figure out if you get direct deposit.