I hadn't seen the Zagat list, thanks for sharing. To be frank, I'm a bit disappointed in their choices. I haven't tried Urbana, Nage, or Zentan, but I can give you a rundown of my take on the others, if you'd like.

Acadiana - been once for food, once for drinks. Verdict: disappointed. Alternative: Georgia Brown's.

Bibiana - been there once. I must say I prefer Luigino's (which was formerly at that location), but Bibiana is fine. I wouldn't go out of my way to eat there, but I wouldn't avoid it either.

Firefly - only been there for drinks. Funky atmosphere, hit-or-miss service, but can't comment on the dining.

Liberty Tavern - solid, but again nothing spectacular in my book. Alternative: Birch and Barley/Churchkey. Pitango, the gelato place on the same block is unarguably top-notch.

Potenza - worth a try.

Rosa Mexicano - solid sit-down Mexican, but it's a chain. If you want something unique to DC, check out Oyamel in the same neighborhood.

Zola - I've been there twice for food and two or three times for drinks. The food is good, but I have been disappointed by their snooty, holier-than-thou attitude. So much so, that I haven't been back in almost two years. That said, the s/o recently took a cooking class with their chef at Zola Kitchen (next door), and thoroughly enjoyed it. Because of that, I may give Zola another chance sometime soon, though I do prefer other restaurants in the area.

Reading back on my post, I think I come off as one heck of a downer (apologies), but I can't honestly say I think Zagat's list was well-composed.