A thought that's occurred to me is to have a board on one wall of the room where people can put some kind of indication of what games they're interested in playing with others and stuff. Maybe just a big whiteboard. The general feeling I had at Sakuracon was that the only way I'd find someone to play Monster Hunter with was if I happened to see someone playing monster hunter and said ZOMG LET'S HUNT MONSTERS TOGETHER!!!!
I kind of want to take the lead as far as game room layout goes this year, so if I do, I'll try to incorporate a lounge suitable for portable gaming (you know, couches and stuff) in the game room.
Also, Slim PSP's can plug in to TV's, so there might be some smallish (20"-30") tv's available for that too.