(I've made this suggestion this in the past, at the Meet the Board session at the Summit and in conference feedback)

I'd like to suggest scheduling a closing keynote session, held at the end of the final day of the Summit. I've seen this done at other conferences, and I've really enjoyed it. They tend to be more along the motivational or thought-provoking lines. Someone like Stephen Covey (if he hadn't died this year), Clifford Stoll (who wrote the Cuckoo's Egg, and is very vocal about the use and limits of technology in education), or Clayton Christensen (who wrote The Innovator's Dilemma - a book that EVERYONE who works in technology should read).

He'd never do it, but it would be fascinating to hear Larry Ellison talk about America's Cup racing - and I'd LOVE to be the person to invite him. ;-)

I'd run a couple technical sessions at the same time for the die-hard technical folks, but I think most attendees could use something that's a change of pace to end the meeting. And give the organizers 5 or 10 minutes to make closing remarks, too.