Sirlin.net Really good sign for sound information on the pros and cons of game design and competitive game playing.
Seconded. I love the way he goes into all the little details of how the games he plays works. His book (which can be read online for free) is also a great example of how the strategies and concepts behind video games match up with those of games like chess and real-world warfare. Keep an eye on his blog, as he tends to reference other interesting designers who make some fantastic points. And play Kongai. I love that game
I also loved A Theory of Fun, as it introduced me to thinking of games as learning experiences. How we enjoy them because our brain responds positively to learning. I really love that idea, and I try to make use of it in all the games I design.
Oh my god I'm going to be digging into these links for weeks
Me too!