The John D. and Catherine T. MacArthur Foundation have released their series of books about Digital Media and Learning. Not only that but they've made them available to download free for those of us with little disposable income :)
The one I was interested in was "The Ecology of Games: Connecting Youth, Games, and Learning", which contains a variety of articles which together are "pointing toward a more sophisticated understanding of the myriad ways in which gaming could and should matter to those considering the future of learning."
If you are seriously interested in using games, especially digital games in teaching and learning, this is a very valuable collection of writings by experts in their field.
I'd also recommend James Paul Gee's book "What Video Games Have to Teach Us About Learning and Literacy" as an introduction to get you thinking about the topic. There are some copies in Edge Hill's Library and a revised edition out in April.