If it's just a game I'm buying to "support" the author (long stare right into the camera), I don't do anything with it.
If I'm thinking of a campaign, I put the campaign idea in a folder and put the folder by my desk. Every so often I come across a new roleplayer or I learn something new about someone I already game with, then I take the folder out and see what I think I can put a group together for.