9-D in Carroll Gardens
I agree with missmasala for the most part, although i think it depends on what you want---
i think ghang thai on court (not sure of the smith st location) has really nice tom yum soup--it's spicy and they serve an entree size with rice noodles. sometimes that is all i want to eat for lunch, especially in the winter.
i love that nine-d has a great dry curry--it can pack some heat if you want that, but don't want the heaviness that comes with a regular curry sauce...
It's a relaxing space, the food is decent, and the family that runs it is super-nice. Does it come close to the authentic delicious thai in queens? Is it a destination joint? no and no, but if you want thai and you're in CG or CH, you couldn't do any better. I think it's the best thai in the neigborhood.