Staff from Chicago's Seminary Co-op Bookstore pick their favorite graphic works (listed here and here), such as Strange Suspense: The Steve Ditko Archives (vol. 1), The Cartoon Introduction to Economics (if only this had been published before I suffered through my micro-macro econ course), and Donald Westlake's and Darwyn Cooke's Parker: The Hunter. My favorite is Action Philosophers ("Plato! Wrestling Superstar of Ancient Greece!").
(Thanks to UChiBLOGo)