Here’s a video from the organizer of Ignite presentations (which are somewhat similar to TED Talks) giving advice on how to present at those conferences. It, too, provides good advice on giving public presentations. Anecdote shares some additional advice related to the video.
I’ve added these resources to both The Best Sources Of Advice For Making Good Presentations and to The Best Teacher Resources For “TED Talks” (& Similar Presentations)
Both of those lists, by the way, also contain links to The TED Commandments – rules every speaker needs to know which is advice for people who are preparing to give TED Talks.
You might also be interested in The Best Digital Storytelling Resources.