One of the most promising young talents in cartooning makes his debut with a dazzling collection--part freakish dreamlife, part quirk-o-rama autobiography, all genius. Long a fixture in comics anthologies, David Heatley's deceptively crude, wickedly observant drawings have begun showing up on the New York Times op-ed pages and the cover of the New Yorker, introducing him to a vast new audience, Now, in My Brain Is Hanging...