I am an occasional reader of americablog (won't say whether that's
because I agree with their positions or because I'm tracking the "other
side," but those of you who know me will know which way I lean ;-)  In
any case, one of their contributors saw the DC SNOWY OWL late in the
afternoon on Saturday, 3/14.  He doesn't say where he lives, though I
know it's somewhere in NW DC.  Here's a link to his blog on it (with a
nice picture):

http://www.americablog.com/2009/03/snowy-owl-pays-rare-visit-to-my.html

Good birding,
Paul Pisano
Arlington, VA