BarCamp Atlanta is an ad-hoc gathering born from the desire for people to share and learn in an open environment. It is an intense event with discussions, demos and interaction from participants who are the main actors of the event.
Be prepared to Demo or Speak. Barcamp is as good as the participants make it. Be prepared to lead or participate in a session, ask interesting questions, show off cool stuff you're working on and make new friends. Barcamp is not a typical conference where you are fed information in a one-way fashion. If you're planning on attending, you should think about how you'll contribute before you come. And after Barcamp, you should be willing to share with others about what you learned.
You don't need to make fancy Powerpoint presentations, active discussion on white boards is more likely. But if you have tangible items, feel free to bring them.
Sessions can be about anything interesting, we'll draw up the schedule in the first hours of the event and then dive straight in.