There are many groups on Usenet that offer information and discussions about game design and development. The links below are to Google Groups. 
rec.games.design 
- A group for GameDesign, both computer and physical 
rec.game.roguelike.development 
- A group for the design and development of RogueLike? computer games 
comp.games.development.design 
- A group for the design of computer games, although very low Wiki:SignalToNoise? ratio