Tech Square has Moes, 5th Street Ribs, Ray "NY" (blasphemy) Pizza, Tin Drum (Asian)Cafe, St Charle's Deli. North Avenue has the Varsity, Wingnuts, Quiznos and a few other stuff. Not sure about west campus since I'm rarely out of my dorm(I'm a first year). If you are willing go a little further, Check out Gordon Biersch on Peachtree Street(don't ask me which) or The Flying Biscuit(slow service but good food). My knowledge of the area is limited but hope that helps and I'm sure the natives of Atlanta can give you more locations.
and let's not forget, Chuck Norris found the elementary antiderivative of e^-x^2dx from negative infinity to infinity.