Via Pharyngula's lament about the lack of Darwin, I learn that there is an Albert Einstein action figure.

I'm strangely tempted... purely for the geek value. He'd sit on the desk.

Pharyngula links to a Scientific American article which suggests other Scientific action figures:

Isaac Newton: "Pelt your genius action figure with apples until he figures out the gravity of the situation. Equal-and-opposite reaction figure sold separately."

Werner Heisenberg: "Uncertain where you left your Heisenberg action figure? So is he! Check the desk drawers. But don't be surprised if you find Schrödinger's cat. Which may be dead. Or alive!"