Videos of Young Speakers as Teaching Tools

YouTube and TED provide examples of young people presenting (in the case of TED, they are big audiences and high quality recordings). A good example is Birke Baehr http://www.ted.com/talks/birke_baehr_what_s_wrong_with_our_food_system.html
This is a god presuasive presentation containing all the components on an appropriate topic. As such, it is an excellent exemplar to show students - especially those in years 6/7.
His delivery - while it is to be admired - has obvious areas for improvement (he is just 11 after all) so it is still an excellent teaching tool: "What else could he have done with his arms and hands?"