Travelling in and around Atlanta was very cheap and very easy. The hotels that FIRST offers in their packages are typically all under a 20 minute walk from the Georgia Dome. I had a Segway with me last year, I highly recommend it!!

The MARTA was easy to find and travel to and from the airport with, so no shuttle bus was particularly necessary (unless it's included with your hotel accomodations, then go for it!)
Atlanta was fun.
erin