Demos

Here are a few simple applications of various ideas, mainly things such as genetic algorithms, physics and general ALife topics.

Cart and Pole

The cart and pole is a classic control problem, used by some as a benchmark for a controller. The simple version is trivial to control, which is why it is a good way to check your controller is working.
Cart and pole applet, controlled by an evolved neural network

Ants

Ants are often studied by Artificial researchers. This is probably because each individual ant is quite simple, but the ant colony as a whole can be quite sophisticated. Ants show classic emergent behaviour.
Foraging in ants, using pheromones