I didn't really do the bar scene at all in Atlanta so I'm probably the wrong person to ask there. Underground Atlanta might be a good bet if you are into the rap scene.
Flip, off of Howell Mill, is my favorite restaurant of all time (especially given the prices; $10-15 can get you an awesome burger and fried pickles). Taqueria del Sol is nearby and that place is really good too. For brunch, I'd recommend Ria's Bluebird or West Egg Cafe. Ru San's was good for sushi, and if you want BBQ and blues go to Fat Matt's Rib Shack if you can. My brother really likes Alon's for sandwiches and Cafe Intermezzo for dessert, but I have only been to the second once.
The Juniper area also has some really good restaurants, from what I remember, but my memory is failing me now. Atlantic Station has a theatre and some more chain-style restaurants and shops, it was a pretty good place to go hang out.