If you have a PS3, this is the next game you need to buy. I was lucky enough to be part of the online Beta, and couldn't stop playing for the week I had it. The characters are so cute (way cuter than Mario), and the gameplay is fun and bouncy. Essentially, you're a "sack boy" (a boy made out of a potato sack), you can customize him however you want, and you play levels that are built out of everyday items like skateboards and fences. The most exciting part of the game: you can create your own levels with the items you collect! I sucked at creating levels, but it was a lot of fun to play other people's levels. Rumor is there will be levels set to look like Mario Brothers, God of War, Metal Gear Solid, etc. It's the YouTube of videogames!
Even the advertising for the game is so cute... I've seen mini-billboards sticking out of plant pots and on the beach here in Los Angeles. Look out for them!