Mike,
QOC is very much alive and well! Just moved here this past summer, delighted to be back in the "O-Zone" as Valerie Meyer put it. Lots of great terrain and people.
Check out
http://qoc.us.orienteering.org/ for weekly events, usually Sundays but also some Saturdays. No local meets over the summer, but some club members get together for training events, I think Weds or Thurs nights. Probably a good call, it's May and already getting quite hot here.
Are you military? If so, please drop me an email if you're interested in the Armed Forces Orienteering Team. We have a few members in the DC area.
Looking forward to seeing you in the woods!
Tori