Really, it's just a chance to hang out and know what you're about, what you enjoy doing, how you got into the industry, and anything about your time at Apple and with iChat that you care to (or are allowed to) share. We'd come up with a list of questions that we're the most curious about, but I see it as a way to just have a good time on a recording and have a good memory to look back on while sometimes making new connections and possibly friends along the way.
On a personal note, when iChat AV was released, I used to enjoy going into Apple stores and setting up the Macs there with a video conference via Bonjour and I would just leave them that way because I thought it was so neat.