Meant to post this earlier-- from the WashPost last Sunday (12 June 2005):

http://www.washingtonpost.com/wp-dyn...061100595.html

MTA is looking at extending the Green Line from Greenbelt all the way to the BWI airport, with stops at Ft. Meade, Savage, and Arundel Mills. Of course, they haven't event consulted with Metro yet (base closings mean there would be several thousand more workers consolidated at Ft. Meade). The timeline is given as "within the next twenty years."