Smart phone applications can be useful, fun or even addictive and they are, undeniably, big business. This hour, IPR's Charity Nebbe talks to some of Iowa's leading app developers and we'll take a walk through the City of Literature with an iPhone app as our guide. Guests are: Karen Pease, CEO of Celadon Applications, Iowa City; Steve Mitchell, CEO of Componica, LLC, Iowa City; Karl Becker, founder of "Car Care," Coralville; Prof. John Winet, New Media artist at the University of Iowa; and Ben Holland, a graduate student at Iowa State University ("Zombie Strategies").