Had the pleasure of seeing Ian Thomas recently. As somebody who has sat through a LOT of motivational speakers Ian stands out as one of the best I've seen.
He adds a great perspective to a tired motivational topic. (How many times have you attended a speech on how to build teams and played management Bingo? You won't with Ian' approach)
I immediately found myself trying to tell other people about his ideas - failing miserably - but still seeing them have that 'oh yeah!' moment.
Finally - a fantastic speaker, learned a lot just watching his style. Brilliant.
Link to his site is here. Highly recommended.