OMMA Global was in SF last week. I was on two panels about display advertising, and one of them is available through a webcast link. Just click on the video entitled "Will Online Advertising Ever Live Up to the Promise of Precision?" It was one of the best panels on which I have participated, with a lively conversation across a range of topics.
There were a few things that came together to make the panel successful. First, we had a great moderator who focused the conversation. Second, the panel venue was during a private networking lunch where people were able to eat and listen. Eating became the secondary multi-tasking activity, instead of answering email on a smartphone or laptop, so the audience was more engaged. Third, the panelists were sitting in soft chairs without a table separating us from the audience. This created more intimacy and direct interaction with the audience. Finally, the panel was limited to a moderator and three panelists. Whenever you have too many panelists, and I've been on panels with five or six participants, then the audience doesn't get to hear enough from each member and commentary gets repetitive.