Bill Turner at BrilliantCorners points to the DC Subway Blogger Map. I still haven’t seen one for Boston, but of course mapping anything onto the tangled mass that is the Boston T would be tricky. Plus all the college kids would probably have had to choose between locating their blog at their college’s T station or their home one. (For me, that would have been between Kendall on the Red Line and Government Center on the Green.)
And of course we’ll never see a map like that in Seattle, because there’s no subway and the bus system is too boring. Oh well. We still have GeoURL.