Hello fellow online MSWers!
After extensive research into both online and Washington, DC-area MSW programs, Boston University's online MSW came out on top for me. Luckily, I was accepted, and will be joining the Summer 2013 cohort.
I had reservations about doing an MSW online, but I became convinced that there are some solid online programs out there. BU is priced very competitively, particularly for a Washington, DC resident who does not have any options for in-state tuition for an MSW program (Catholic and Howard are both private schools).
I second the upthread caution about programs who leave it up to the student to arrange his/her own field placements.