ARhrrrr, an alternate reality game developed by my College of Computing colleague Blair MacIntyre, his collaborator Tony Tseng, and their students.

I've played this, and declare it awesome. The "riding on a helicopter" theme works well with this physical framework.

Click to view

When Zombies Attack!: Mathematical Modelling of an Outbreak of Zombie Infection

(Actually, they're using pretty standard techniques from mathematical epidemiology, but it is still awesome.)

Hat tip to the Freakonomics blog.

"...we're not unreasonable; I mean, no one's gonna eat your eyes."

Zombie infection simulation! - also check out the links at the bottom of the page.