The Art of Being On a Panel
This 
article by Guy Kawasaki offers the following tips for serving on a panel:
1. Control your introduction.
2. Entertain, don’t just inform.
3. Tell the truth—especially when the truth is obvious.
4. Err on the side of being plain and simple.
5. Never look bored.
6. Don’t look at the moderator.
7. Make casual conversation. You’re on stage, but act like you’re not.
8. Answer the question posed, but never limit yourself to the question posed.
9. Never say, “I agree with what the other panelists have said.”
10. Provide a way to get in touch with you.
