Everyblock's code has been released under the GPL. Everyblock is a site that aggregates and geocodes local data -- news, crime, fire, restaurant inspections, and lets users define their interests down to the block-level.From O'Reilly's Radar:

"Django fans, Python geohackers and anyone who wants to build a local data aggregator are going to be thrilled. Adrian was one of the co-creators of Django and was one of the first Google Maps Mashup creators."