Zpizza has opened it's first location in the District and it is in Penn Quarter at 806 H street N.W.
Penn Quarter insider was there last night and the pizza is good. The space is open, but there seems to be a shortage of tables that seem comfortable (i.e. there are none).
However, the staff couldn't be nicer, the food was delicious, and they deliver.
You can also order online. Use the promo code BOGO1210 for buy one get one free rustica pizzas. Sign up for their email list, and get $5 off.