Guy Kawasaki's presentation on 'The Art of Innovation' is worth recommending not just for the anecdotes, insider view, venture capital experience and pithy rules to innovate, but also for showing how to present to a conference.

Humour. A good sense of humour is good. If you don't have it, don't try and fake it, but if you have it, flaunt it....

This keynote was from 2007 - but having only just discovered it 4 years later I thought it worth passing on...