To get a little more experience with ActionScript 3, I wrote up a very simple class which will take a rule number, and then generate a cellular automata based on that.
The movie below requires Flash 9 or above to be installed. Some rules to try out: 90, 30, 73, 110, 150. Valid numbers are 0-255, but not all produce interesting results.
Direct link to flash movie (got some people complaining the SWFObject script doesn't work under Vista)