The room was filled with engineering whizzes and other people really excited about modeling a virtual 3D version of the real world and layering it on Google Earth's satellite maps in order to see every building in every city in eye-popping, textured detail. There was also much talk about the use of ComStat by police departments to track the location of cop cars. ComStat basically allows police to be held accountable when crime rates don't seem to be going down, say, in the Cherry Hill neighborhood of Baltimore, because all the officers are clustered around the Dunkin' Donuts on Howard Street. (You watch The Wire, right?) The big idea is that ComStat could be used in lots of cities for lots of problems, in a way similar to New York's use of 311, the municipal help line. But instead of dialing up on the telephone to report rats in your neighbor's trashcan, or a big pothole on Broadway, users would upload photos or stories about their issues to ComStat-like Google Earth layover software, and this would be monitored by city officials.