Eagleflip,
For one of the busiest airports in the world Atlanta's Hartsfield really is one of the easiest. The controllers really know how to move some tin. If you arrive during one of the peak times be ready for some fast paced action though.
Starting with the arrivals:
Get the ATIS early and know which runways are in use. The crossing altitudes and speeds are "expect to" so be ready to keep the speed up if they don't tell you slow down. ATL lands on the outside runways and takes off on the inside runways. So if you're coming in with a Macey or Rome arrival you will most likely land on 8L or 26R. If you are coming in LaGrange or Sinca you will probably get 9R or 27L.
If they don't tell you a speed go as fast as practical for your aircraft - it usually means you are in the front of a pack and you really want to stay there. When given a speed comply as quickly as you can. When given an altitude or heading do it promptly as is safe and consistant with your aircraft's POH. Listen to the radio carefully, this is not the time to miss a call.
On the approach: Keep the speed they issue until the marker. If you are unable for some operational requirement let them know early, they will have you sequenced very tightly in visual conditions. You'll see them lining up on your TCAS, just follow the instructions and it's a piece of cake. It is not uncommon to be on a very short final and the preceding aircraft is not clear of the runway. Be ready to go around if the guy ahead misses the turnoff or does not clear. Another option if there is not someone waiting is to ask for clearence to sidestep to the inner runway and land, that can save you a go around.
Ground operations:
Take a good look at the airport diagram and have it available for your taxi. All taxiways are clearly marked and there really are not any traps that I am aware of. Also the tower and ground have a good view of all of the movement areas so if you are not sure just don't do any dumb like crossing a runway without a clearence.
Have fun.