I've gotten permission to release Chapter 3 from my book, Everyone Plays at the Library, for free. This chapter presents a model of game experiences that I developed in order to bring together games of all types. Instead of focusing on a game platform, it focuses on the experiences players have in the game.
The SNAKS model of game experiences is built out of this model of a game experience in a library:
and highlights 5 areas of importance in the model. These areas are known as SNAKS: Strategy, Narrative, Action, Knowledge, and Social. These aren't exclusive categories, so something can be both Action and Strategy, but I use this system to organize the rest of the book.
The idea is to help people who are picking games to consider what type of game experience they want to create, and then use this model to select specific games.
You can get this chapter at http://scottnicholson.com/pubs/conceptualmodel.pdf
You can also find Chapter 1 for free on the publisher's Web site at http://books.infotoday.com/books/Everyone-Plays-At-The-Library/SampleChapter.shtml
Nicholson, S. (2010). A conceptual model of the library gaming experience (pp. 21-30). Everyone Plays at the Library: Creating Great Gaming Experiences for All Ages. Medford, NJ: Information Today.