Really good game. Its puzzle-physics game and its incredible. I cant explain but its really fun. You need to play it to get the feeling. Here are some videos :
http://www.youtube.com/watch?v=-A_JfkzPwww
http://wii.ign.com/dor/objects/14230233/world-of-goo/videos/goo_3_041408.html
http://www.youtube.com/watch?v=-A_JfkzPwww
http://wii.ign.com/dor/objects/14230233/world-of-goo/videos/goo_3_041408.html