Mike Malone, who handled a fire side chat with Elon Musk today, characterized him as really Entrepreneur Extraordinaire. The discussion on Wikipedia itself is an ample illustration of that. Elon's versatility is quite self-evident. An individual who built several successful information technology companies has now gone on to build several more in other fields: SpaceX, Tesla Motors and SolarCity.
The presentation by Chamath of Facebook was another excellent one. The slides were not at all busy, but still made the points very eloquently. For networking professionals focused on actual plumbing, it is very thought-provoking because he introduced a "social stack", after discussing the OSI stack and the LAMP stack. It looks like Facebook is really a good platform for consumer-oriented social networking applications. Its applicability in the business world, however, is not all that obvious [to me].
Probably the most moving of all presentations was one by John Wood. After leaving Microsoft, he founded Room to Read, a non-profit organization focused on promoting education of under-privileged children in the world. To date, it has produced awesome quantitative results. With a few more John Woods, the world will be a much better place to live. The presentation brought tears to my eyes.