Domestic Film Production Equity Act of 2008 - Amends Internal Revenue Code provisions relating to the tax deduction for domestic film and television production activities to: (1) include within the income base for such deduction compensation for services performed in the United States by actors, production personnel, directors, and producers and any copyrights, trademarks, or other intangibles with respect to a film production; and (2) allow a deduction for partners or S corporation shareholders who own at least a 20% interest in a film project.