That’s on a MARTA train. The Holiday Inn is ~4 blocks from the Peachtree MARTA station (that’s a rough guess, if I remmeber correctly). If you call the hotel, they will have an exact distance. The CNN center station might be closer, but you would have to change trains at Five Points. If you got off at Peachtree, you wouldn’t have to worry about that. The ride from the Airport to downtown is about 25 minutes or so. Kind of cool during the day, because you get to see a lot of the city (the MARTA is above ground for the most part).
You can see the MARTA map here:
http://www.itsmarta.com/getthere/schedules/index-rail.
Hours of operation are listed here:
http://www.itsmarta.com/howto/hours.htm - Looks like they run till 1:30am … so you should be fine. It also has the times about how often the trains run.
Hope this helps 
edit Darn … Jeff beat me to it.
:eek: :ahh: