2 Tiny Games
One of the things I loved about playing Deus Ex: Invisible Wars was the ragdoll physics used to model the behavior of dead bodies. I admit, I took a perverse pleasure in throwing bodies across the room and watching them bounce realistically off of things and generally splay their limbs everywhere. And I'm not alone! The Dismount is a physics-based game engine, the comes with a game where you have to push an unconscious man down the stairs and through a short obstacle course. Hilarity ensues. It has other games, but I haven't downloaded them yet.

While I'm on the topic of tiny games, Sweaty Palms by Ian Bogost is a neat little widget that simulates the act of trying to hold hands on the first date. Its meant to illustrate how anticipation can be modeled in a game. Its not as fun as Dismount, but being fun isn't really the point. Its more just to demonstrate an alternative interface idea - the kind of thing that be built into a game. But I found it really interesting, so maybe you will too :)