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On speakers: As a TED/ TEDx organiser,how to find, select, prepare speakers.

What advice would you give to a group of young people who are doing the footwork organising TEDx where my question specifically focuses on the speakers?

What makes a good speaker? By this, I do not mean the guy who wins speaker of the year in national competitions, but the TED talker who will cause the audience to leave saying "that was great!"

What speakers bring risk, such as college professors who lecture, but don't understand giving a great talk in 18 minutes? Or the risk of sounding like a TED re-run, finding local folk who have a subject similar to what we see on TED.com. TED has been a rising star, but to keep the quality and not have it become passe, it needs to be fresh. How have you done so? Any thoughts from your experiences? This part of the answer may be best illustrated with war stories - your best and worst selections. Humour is allowed and appreciated.

Do you recommend auditions? If yes, say more.

What about breaking talks with the creative arts? Selecting musicians, actors, jugglers or whatever? Any thoughts or experience.

Ditto your thoughts on shorter talks... Success or failure on 3 minute slots?

Once speakers are selected, how is the mix put together, so the audience stays with it. This may seem obvious, but experiences will probably be varied. If you put some thought into your line up, tell us how you did it. For example, do you schedule heavy-light-heavy, or vary it by time of day like the background music guys do in restaurants? What are your best and worst stories?

How do you prepare speakers? Some folks are nervous, others are challenged by the time. Some TEDx speakers get off the stage after their talk and then wish they had another chance - their real presentation was their warm up. What's the best way to help the speakers do a great job? Have you used coaches and if so, what makes a coach? How effective?