Koster's Theory of Fun

I was at an interview with Ubisoft a couple of days ago, chatting to a designer who mentioned Raph Koster's book A Theory of Fun for Game Design. I haven't read it myself so I decided to do a bit of swotting up. Grand Text Auto have a review with a bit of reader comment and a reply from Koster himself. Slashdot also have a review and Terranova has some good, detailed discussion between readers and Koster.

At the end of the day it sounds like it's not so interesting for academics or industry folk, but rather is an introduction for people who currently only play but want to start thinking about them more deeply.