I'd also love to know the answer to this, although I live a bit too far away from DC for any deliver from there to be feasible.
Every since I moved to MD a few years back, I've been looking for a good pizza place, with no results. I would give pretty much anything to get a nice big Round Table pizza, but we're stuck with lesser places.
So if anybody here knows of a good pizza place in the Odenton/Crofton/Columbia/Millersville/etc area, feel free to speak its name!