Rael has implemented an idea by Steven Johnson.
Give it a whirl (you’ll need a Google Web API developer’s key) or download the source for your mutating and spindling pleasure.
From a later post:
Steven Johnson has a 0.34% googleshare of “Emergence”
Slime Mold has a 0.04% googleshare of “Emergence”
I think this fits in the category of “proof of concept” web services application, but it’s cool nonetheless.