Main Street Protection Act of 2008 - Requires the Federal Deposit Insurance Corporation (FDIC) to insure deposits under the Federal Deposit Insurance Act without regard to the amount on deposit in any account or the amount of the deposits of any customer.
Directs the Secretary of the Treasury to establish a program for insuring the principal amounts on deposit in any money market account using the U.S. Treasury stabilization fund without limitation on the amount insured in any such account. Authorizes the Secretary to make appropriate assessments against the institution holding such accounts to cover the cost of providing such insurance.