http://www.bubblebox.com/play/action/1675.htm
A game where you take over the world with zombies. You create a small group of zombies in a city, and they run about creating more zombies while fending off armed attackers. You collect money from dead bodies and destroying cities, which you can then use to upgrade your zombies. Plus, you can kill hero characters in order to get special zombies, like zombie Colonel Sanders.
It devoured my entire afternoon.