Michael's proposed Brown Line
Will commented that the eastern quadrants needed more north-south subway service.
This brought to mind Michael's "Brown Line" proposal. (Michael is the proprietor of the fabulous Dupont Circle Update e-newsletter and is the great flickr photographer, Eye Captain.)
I didn't get it at first. But he makes a compelling argument:
The point of the brown line was to take advantage of the new Wilson bridge ... without going all the way around the beltway, and adding more service to DC rather than MD and VA!
In Anacostia it would spur development around Bolling AFB, and around Capitol Hill it would provide a crucial alternate north-south route to relieve congestion in the center of the Metrorail system.