Here are three here in Washington, DC.

Taberna del Alabardero. VERY expensive. The food is delicious and beautiful, and the service is second to none. Luminaries and dignitaries eat here.

http://www.washingtonpost.com/ac2/wp-dyn?node=entertainment/profile&id=791947

Jaleo. Trendy and expensive – but not as expensive as Taberna. Tapas are their specialty. Younger, trendier crowd than Taberna.

http://www.washingtonpost.com/ac2/wp-dyn?node=entertainment/profile&id=791767

Rincon Espanol. Good, traditional Spanish food. Reasonably priced. Great neighborhood.
http://www.longwood.edu/staff/lgoetz/ModLang/DCTripRestaurants.doc