Any recommendations for picking up a car at Atlanta/Hartsfield? I know all the cars are outside the airport, but are some of the agencies closer/easier to deal with than others? Thanks!

I usually rent from Avis when I go to Atlanta. If you are a Wizard member, all you have to do is go to the shuttle and they'll drop you off right at your car. It's painless. All of the car rental places are clustered in the same area and they're literally 5 minutes from the airport. It'll take you longer to get from your gate to baggage claim than to the car rental place.