So I used turbo-tax and filed my taxes by Feb. 2, 2008 and used direct deposit. My last two digits of my social is 56, how come I hadn't received my stimulus check?

Assuming you qualified you were suppose to get yours by May 9th, which most likely means the IRS is merely running a little behind.

Stimulus Payment Schedule for Tax Returns Processed by April 15 (http://www.irs.gov/irs/article/0,,id=180250,00.html)