TED is a great resource for free videos of talks on lots of business, media and technology subjects. Examples include marketing guru
Seth Godin's talk on
how to get your ideas to spread, where he spells out why, when it comes to getting our attention, bad or bizarre ideas are more successful than boring ones, and
Jason Fried's
why work doesn't happen at work in which he discusses his radical theory of working: that the office isn't a good place to do it.