As many of America's cities experience economic revival and draw young professionals and retirees to city life, many urban churches face uncertain futures and complex challenges. How are they finding creative ways to build community? How do they find the money and the members to serve long-term residents and newcomers?Bob Smietana - Senior News Editor, Christianity TodayRev. Leslie D. Callahan - Pastor, St. Paul's Baptist Church, PhiladelphiaShane Claiborne - Founder, The Simple WayAlvin Sanders - Senior Vice President, World Impact