Abram: demoed cellular automata using a Lisp program that outputs C code
    code is on Github: http://github.com/abramhindle/automata-dsl
    also showed us simulations (automata, Free Quake) being used to generate sound patterns

Paul: demoed Visual Frameworks (state machine) implementation of Hickey's ants.clj
    code is longer, but perhaps easier to understand

Doug pointed out the Flux framework: http://flux.cs.umass.edu/

discussed with-places macro (On Lisp)
Justin: destructuring-bind useful for teasing apart structures in Common Lisp