haiiro
First Post
For me, it'd be the 3.0 PHB and -- much more recently -- Eberron. Actually, in the case of Eberron, reading the book made me want to play in a campaign, not DM it. 
I have a sneaked suspicion that both Grim Tales and d20 Future will have this sort of effect as well -- the former appeals to my inner rules tinker, and the impending appearance of the latter has given me some fun ideas for a non-fantasy game.

I have a sneaked suspicion that both Grim Tales and d20 Future will have this sort of effect as well -- the former appeals to my inner rules tinker, and the impending appearance of the latter has given me some fun ideas for a non-fantasy game.