If there's any justice in the world, 2D Boy's World of Goo is going to be a hit this year. It's already a finalist in three categories in the 2008 Independent Games Festival awards; up for the Grand Prize, the Design Innovation award and the Technical Excellence award, and deservedly so. Simply put, World of Goo is one of the most appealing puzzlers IGN have come across in some time.
The basic concept is somewhat similar to Lemmings – get a requisite number of your charges to the exit by using their particular skills. That's, however, where the similarities end.