Everyone who can get to Melbourne totally should and go to ACMI (Fed Sq) they have an exhibition on at the moment called GAME ON!
its an exhibition of all computer games from the earliest of Pong right through to old school arcade games of Pac Man and Space Invaders and on to the more recent of those such as Wii and Guitar Hero (which my friend got the highest score for when we were there YAY!)
Cost is like $10 for concession but the games are free so you can play them unlimitedly so if you get there early you can play all day as much as you want! Well worth it guys!