For those of you listed on the D.C. Metro Blog Map, perhaps you'll experience a slight rise in traffic due to this Slate article by Brian Montopoli on City Wide Web:
The premise behind a blog map is simple: Some industrious blogger posts a subway map of his or her city (if you live in a city without a subway, well, that's your problem) and then organizes the city's blogs by the stop to which they are closest. If residents want to explore their neighborhood blogosphere, they simply click the section of the city that strikes their fancy. The result: Local bloggers find each other, exchange e-mails, meet up for drinks, and then generally do the same things as neighbors who stumble upon each other in the real world.
I've been listed on the blog map for about 9 months or so and I've enjoyed the extra traffic it sends my way. Further, I do spend a little time on the map now and then checking out my neighbors, like Dave Tepper.
Link courtesy of listen missy.