Disney is all set to officially release its foray into the massively multiplayer arena on June 2nd with Toontown. However, players are already able to download the game from the Toontown website and try it out for a few days, after which you can either ditch it or subscribe. A full retail package will be available in September.
Naturally aimed at the youngsters, but more than likely played by a higher proportion of 'adults', Toontown is stuffed full of mini-games and competitions to take part in with other players. According to IGN, you can also create a giant walking cat called Duke Whiskersocks and throw pies at robots, though presumably not at the same time. Sounds like the perfect game to us.