Most car lots advertising "no money down sign and drive" are employing the methods outlined on our homepage to satisfy lender minimums while moving cars off the lot with 0 down. Many of these car are "buy here pay here car lots," otherwise known as BHPH dealers.
These dealers are often open to a more liberal spectrum of credit types (bad credit, no credit, etc). On the other hand, they often hit you with higher interest rates than you would get from a credit union or bank. If, however, you're a subprime borrower with rocky credit, then you might very well be rejected from these more traditional lenders -- especially with the current state of the economy. Creditors are tight-fisted these days, no doubt.
To find 0 down car lots in your area, apply for no money down auto loans from a trusted service such as the one hyperlinked in this article.