Hi,
Way back when I was very excited by genetic programming as written about by this guy in his book genetic programming -
http://www.genetic-programming.com/johnkoza.html
I wrote a simple interpreter for a lisp like language that simulated autonomous agents ran in a simulated environment, the langauge descibed the agents behaviour which survival and breeding opportunities depended on. The population should have evolved one or more effective programs for survival within the environment, it was very exciting at the time. The limitation was the relative simplicity of the environments I was able to create before completing my studies and starting work.
Thoroughly enjoyed Koza's book and all the projects I have done in genetic algorithms and genetic programming, it was a really exciting area in 1992.
Duane B