Awww, what a cutie! (Especially in the much more flattering second photo.) I hope that either his people find him or that someone adopts him from the shelter.
You might try posting to the Craigslist pets section ( http://washingtondc.craigslist.org/pet/ ), in case his people are looking there but aren’t on PoP.
The kitty also sounds like a good candidate to be “pulled” from the shelter by a rescue group.