A Whole New Mind by Dan Pink
An incredibly interesting best seller. Makes a case for gaming + play in both education and business. Check out his blog or his online videos on YouTube.

What Video Games have to Teach Us about Learning and Literacy by James Paul Gee
The title says it all.

Gaming Lives in the 21st Century by James Paul Gee, Gail E. Hawisher, and Cynthia L. Selfe
Focuses on the stories in games--could be inspiration with finding books to pair up with a particular game for a literature class.

Changing the Game: How Video Games Are Transforming the Future of Business by David Edry
Games + business.

Playing to Learn: Video Games in the Classroom by David Hutchison
Practical advice about putting gaming in the classroom

How Computer Games Help Children Learn by David Williamson Shaffer
Video games = education + learning.

Books on Second Life. You can find these books on Amazon.