If you're looking for a comprehensive overview of gaming and libraries, you must get a copy of the Sept/Oct issue of Library Technology Reports. In 9 chapters, Jenny Levine introduces the gaming generation, explores the cognitive processes involved in gaming, details how to set up games and tournaments in your library, and presents interesting case studies of how games are being used in public, school and academic libraries. This is a must read for anyone interested in gaming in libraries.
Levine, J. (2006). Gaming & libraries: Intersection of services. Library Technology Reports, 42(5)

If you've been working on developing a great game or are interested in discussing the gaming topic, a call has gone out for presenters for the next Gaming in Librabries Symposium:
http://www.techsource.ala.org/blog/2007/01/gaming-learning-and-libraries-symposium-call-for-presenters.html