Washingtonian's Cheap Eats issue is now on newsstands, though its full coverage is not yet available online. They have, though, published an unranked list of their top 25 destinations for inexpensive dining.
Just about every international cuisine is represented here, including Thai (Thai Taste by Kob, Ruan Thai), Vietnamese (Rice Paper, Huong Viet), Yemeni (Saba) and Bosnian (Cosmopolitan Grill). A few American options crept onto the list, including barbecue joint DCity Smokehouse, Cajun-influenced Bayou Bakery and Haute Dog and Fries in Alexandria.
The full list is here.