Yes, that's Rabieng, the little sister to Duangrat's on Leesburg Pike. I'm embarassed to admit that I didn't know that they do a "thai street food" sort of dim sum; gotta order off the menu, no carts.
Wife and I went on Sunday. Bottom line: loved it. 6 items, two thai iced teas, total bill including tip $28. I especially enjoyed the dried beef with sticky rice and the duck spring rolls.
Anyone else with dim sum experience here? i was sorry it was only two of us; wanted to try a lot more!