RE: Mexican Food in Atlanta?? PLEASE!
I also need to point out the Taqueria Los Hermanos in Tucker (4418 Hugh Howell Road, in a Publix-anchored shopping center) - kind of a distance from Marietta, but a pleasant little spot, with a regular selection of tacos, plus a daily special that's always unique and interesting. They also have a great shrimp-corn chowder.
You will certainly want to look up and down the Buford Highway in Chamblee-Doraville. Lots of very authentic Mexican, and Chinese, Vietnamese, Korean (do check out the Creative Loafing mentioned on this thread).