One of my best friends went to ATL to interview for the summer internship a couple of months ago. He didn't get it, but the it sounded like they were impressed by him and told him that he's got a fairly high chance of getting it for this fall.
From what I understand they put you in the safety office, but you have the option of spending days at other offices as well. It also sounded like they work closesly with the NTSB and their internship program. You have the option of swapping places with the NTSB's intern for a week. The other huge upside is that they pay $11 an hour. Not to many internships out there that still pay.
He interviewed with XJet, Fly I, and JBlue, and said the only one he really wanted was the Delta one, so I geuss he was pretty impressed by what they had to offer. I'll keep ya posted if he gets the job, I'm sure he'd be happy to come on and share his experiences.