Miika & Rovio: The Angry Birds game is magnificent. Both I and my 4 year old daughter play it constantly. She's always bugging me, "Daddy, can I play piggies?" She has a real feel for ballistics already...

I want to register a vote for the suggestion made earlier in the thread: I also would really like a version of the game that has a "custom world" for user-created levels, so that I can keep the official levels and high scores pristine.