good week-end read... literally, may take a whole week-end... or 2 
http://www.necsi.org/publications/dcs/Bar-YamChap6.pdf
and if you have the stomach, try that:
http://www.necsi.org/projects/sayama/NATOevolution.pdf
"the gene center view of evolution and symmetry breaking and pattern formation in spatially distributed evolutionary processes"... brutal!
all from: http://www.necsi.org/publications/dcs/index.html
http://www.necsi.org/publications/dcs/Bar-YamChap6.pdf
and if you have the stomach, try that:
http://www.necsi.org/projects/sayama/NATOevolution.pdf
"the gene center view of evolution and symmetry breaking and pattern formation in spatially distributed evolutionary processes"... brutal!
all from: http://www.necsi.org/publications/dcs/index.html