Thanks to Gayla's excellent directions, Mae Rasy was easy to find. It is very small, and the Vietnamese place next door (Mien Trung, I believe) had more business and featured $3.99 bun choices and bowls of congee at the same price. Mae Rasy had a very small selection of items for 2 or 3 item plus rice lunch special (I think 2 items plus rice was $3.75). Chris chose the chicken curry--which she thought was very good and spicy--and fried chicken--which was just ordinary fried chicken. I looked over various pictures and menus trying to find something that wasn't Thai. I ended up choosing Lard Nar, and then realized later that I had eaten it elsewhere under the name Lad Na (I think). The nice person behind the counter said it was both Thai and Lao. Their version was quite good. The noodles were thick and seemed to be both hand made and hand cut. The veggies were not overcooked, and the seafood was fine, if predictably shrimp, squid, and krab. The sauce was very nice and very spicy.
Finally, I secured a take-out menu and noticed a bunch of Laotian soups listed--kengs, I believe they were called. When I asked about them, the nice person behind the counter said that they had to be ordered a day in advance because the spicing was so complex and that they were no longer available by the bowl--instead one ordered enough to feed a large party, twenty or thirty dollars worth.
Anyway, the experience was good, but I don't know if they had anything available that was truly Laotian. Still, if a bunch of hounds wanted to share a huge amount of Laotian soup, this might be the place to go.