Here are a few spots to grab a quick bite in and around Atlanta:
Al Pastor burrito from Taqueria El Rey Del Taco
Taqueria El Rey Del Taco (Chamblee/Doraville)
5288 Buford Hwy NE
Tacos are OK (have had better elsewhere), but the Al Pastor burrito was delish! Good food, reasonable prices, and open 24 hours.
Elwood's Pizza (Brookhaven)
3883 Peachtree Rd NE
While I think Fellini's is better, this place still serves up a pretty decent NY style slice (in my opinion). Try a regular slice with The Works.
Spondivits (East Point/ATL Airport)
1219 Virginia Ave
I love this place. The seafood is always fresh (I'm a big fan of the peel-n-eat shrimp), and they serve up one of the better bowls of New England Clam Chowder I've had. Perfect spot for a quick bite before heading out of town. They also have a location north of the city in Cumming.