DC Gourmet Stores
http://dc.about.com/od/restaurants/tp/gourmetfoods.htm
Gourmet International Market: http://www.rodmans.com/ 5100 Wisconsin Avenue Northwest, Washington D.C., DC 20016-4123
Excellent wine and spirits: Schneider's of Capitol Hill http://www.cellar.com/
Amazing hard-to-find liquors: Ace Bev
P and C Market carries gourmet items and Polyface meats: http://www.facebook.com/pages/Washington-DC/PC-Market/164589065004
Arganica - http://arganica.com/ brings fine farm products to your door
Fine wines, liquor and cheese: La Cheeserie http://www.dcfoodies.com/2008/02/la-cheeserie-at.html 4339 Connecticut Avenue, NW (one block from Van Ness/UDC Metro stop)
More cheese and wine for the Virginia crowd: http://www.cheesetique.com/
== Ethnic Food Stores ==
Capital City (Florida) Market: http://capitalcitymarket.blogspot.com/ has tons of stores (map on that page) with hard to find african, indian, and latin american items, and of course A. Litteri's : http://www.litteris.com/
Caribbean Market II http://local.yahoo.com/info-12487321-caribbean-market-ii-takoma-park