National Lighthouse Stewardship Act of 2008 - Amends the National Historic Preservation Act to direct the Secretary of the Interior, through the Director of the National Park Service, to establish a three-year pilot program under which the Secretary shall provide grants to eligible entities for the preservation and rehabilitation of historic lighthouse structures.
Establishes in the Treasury a National Lighthouse Stewardship Fund consisting of such amounts as are appropriated to the Fund under this Act.