Thanks for the suggestions!
I've thought about submitting TSoG to the IGF before, but $95 is not a trivial amount of money to me at the moment, and I'm not particularly confident that it will end up a finalist. The number of games submitted to the IGF increases every year, with--I think--last year's draw being somewhere in the neighborhood of 400 games. That's a lot of competition for comparatively few spots.
As for Amazon, Direct2Drive, Impulse, Steam--those are all places I intend to sell TSoG, if I can convince them to feature the game. (Steam, especially, is incredibly difficult to get a game onto.)