There is a guy who is born in the same country where I was born.
His name is Gonzalo Frasca, he did a Master in videogames in the
university in Atlanta and worked for Cartoon Network. His PHd: thes
is called "Videogames of the Opressed" and refers very much to
Huizinga.
He created the concept ludology and runs a page
http://www.ludology.org, very useful to discuss games and the
culture of the games.
His work can be downloaded in
http://www.ludology.org/articles/thesis/gamesandvideogames.html
More about Huizinga here:
http://www.electronicbookreview.com/v3/servlet/ebr?command=view
_essay&essay_id=zimmerman

You can buy the book at Amazon for 7 bucks.
Ana

PS: Gonzalo Frasca founded a game company who did two great
games/simulations with political frames, the 12th September and
Madrid. The adress is http://www.newsgaming.com/newsgames.htm