Aww. Here's something me and the testers at work are pretty psyched about.
It's a PS3 game called "Little Big Planet." It's basically a cute mutliplayer side scrolling platformer with real world physics (and I really mean real world! Look at that string fly!).
The point of the game is to get from start to finish. Not very hard. But you need need companions to get there, to help move objects away, roll balls, etc.
The game is completely online on the PS3 Network, so you play with your friends. Levels are actually created by users themselves, so there is no shortage of different stages to play.