Gerbil Physics is a physics-based gerbil demolition game for the Xbox Live Indie Games service. The aim is to demolish buildings formed of gerbils using a variety of demolition tools.
Gameplay video: http://www.youtube.com/watch?v=Q-ZCnQ6x5GI
As the developer I'm obviously biased to say its worth a look and is great value for only 1 dollar. Dont take my word for it though, these people said nice things and I didnt pay them: