TED, which hosts the famous TED Talks, just put out this call:
For the upcoming TED conference — TED2012: Full Spectrum — we’re looking for 10 of the world’s best teachers to take the TED stage during a special session we’re calling The Classroom. We’re accepting nominations to help track these people down. You can nominate yourself or a remarkable educator we should know about — who doesn’t have to be a teacher in the traditional sense.
You might also be interested in The Best Teacher Resources For “TED Talks” (& Similar Presentations).