Mapping out the Simpsons

Guide to Springfield USA
This is a must visit for any fan of "The Simpsons." You can file this one under the "people with too much free time dept.," but it's still pretty cool.

Here's an explanation from the site:
The mapping of Springfield began in the Spring of 2001 when we realized that no adequate map of Springfield existed either online or in print. Initially the content was collected from the City Profile and Springfield Vacation pages at The Simpsons Archive, but it has since been expanded by numerous viewings of most episodes of The Simpsons.

They also state the following:
The Map of Springfield has been added to the Harvard Map Collection of the Harvard College Library. The Harvard Map Collection is the oldest map collection in America, and has a strong commitment to digital resources.