T. Harv Eker
Harv Eker is hands down the best speaker I have ever heard, bar none. He actually had people RUNNING to the product sales tables before he was even done speaking - I kid you not.
Harv's presentation revolved around resetting your mental money thermostat to think like a millionaire. His presentation was EXCELLENT - you should go buy his book Secrets of the Millionaire Mind: Mastering the Inner Game of Wealth immediately, and read it! I can't even begin to explain what he did in that room, but I doubt that anyone who watched his presentation will ever think about money or wealth in the same way again.
Grab a partial at audio of his presentation at my friend Paul Colligan's blog.
Don't think about it, just do it… trust me.