I learned about the New Jersey State Atlas, a Google Maps mashup of New Jersey state data, on MetaFilter Projects, where its creater, John J. Reiser, posted it. Here’s how he introduced it:

Originally a product of “hey, what can I do with Google Maps and mapserver?” the site has slowly grown into more of a “hey, what should people in New Jersey see on a map?” I live and work in New Jersey, and am a civil servant of the State. I feel that publicly available information should not just be available, but also accessible. New Jersey provides a massive amount of information online, but it’s not always easy to use. By putting some of these available data sets online in a friendly, intuitive format, I hope that people within Jersey will use them to inform themselves.