We got some good news about the Marvel Universe MMO but let's not forget about the other Marvel MMO from Gazillion. Super Hero Squad Online, the free-to-play Marvel super hero game for kids, is now out on the PC.
The browser based game sees you playing as kiddie versions of your favorite super heroes as you go on quests against evil forces or decorate S.H.I.E.L.D.'s Helicarrier Headquarters. Last I played this, it was honestly fun. Nothing that I would sink more than an hour into, but it's definitely a fun game and something any Marvel obsessed child will dig.
Either way, check it out. It's free to play after all!