I understand neutral networks are a hot topic these days - here's a piece about a new technique breaking some ground. But mostly I linked because it's name is a geek factor home run.
"...To begin to understand the patterns of DNA changes that result from neutral mutation, Hwang and Green developed a new version of a powerful statistical technique that they call "Bayesian Markov Chain Monte Carlo sequence analysis." Basically, the technique enables them to feed in sequence information from genomes of different organisms and discern patterns that can distinguish models of mutational mechanisms.