Adweek has chosen Arby's micro site www.burgergreaseart.com as its Ad of the Day for March 19. In the video, created for Arby's by Fletcher Martin, artist Phil Hansen paints a version of the Mona Lisa in grease from hamburgers. The micro site directs visitors to e-mail the site link to others or to the Arby's Web site to join Arby's Extras member e-mail club for a coupon for a free Roastburger.