Idea and format of 5-minutes presentation is interesting. Each speaker gets 5 minutes and 20 slides. Each slide folds automatically after 15 seconds. The intention is to force the presenter to focus, to rehearse, and to be interesting.
I first learned about 5-minute presentations from OSCON 2009 video shown below. (These presentations are technical in nature but you should get the idea by watching the introduction and first presentation.)
The following is a 5 minute presentation by Seth Godin. He talks about who is linchpin. This presentation is truly a piece of art. I don’t remember I have seen anything better than this.