Well, since the judges and staffers are weighing in...
BTW, I'm not dissing any of the other fine nominations (well, except for those slackers at ENPublishing), but I want to bring up the subject of another excellent company that may have been overlooked:
I'd like to nominate Paradigm Concepts.
Their involvement in the RPGA through Living Arcanis is untouchable. Sure, they may not be the belles of the ball here on ENWorld, but when you see them in action at a convention, it's an RPG force of nature: they don't get time to socialize, the whole team is constantly running events. It's not an easy feat, putting out modules like that on a regular basis, with a constantly evolving world, but they manage to pull it off, and it's awesome to know as a player that your actions could affect not only your game, but the one that everyone else plays.