Los Angeles-based shopping comparison engine company PriceGrabber.com said today that it has added Dennis Holt and Christopher McGurk to its board of directors. Holt is Chairman and CEO of Patriot Communications. Holt also serves on the board of Westwood One and United Online. Christopher McGurk is the former Vice Charimand and COO of Metro-Goldwyn-Mayer. PriceGrabber provides online shopping comparison services.