Steve Jobs at MIT Sloan School of Management (1992) [video]
Listening to this talk, you get a sense of how much more intelligent he was than he may have even gotten credit for. All the talk about his temper and his stealing of engineers ideas, an imperfect boss, etc, sorta gives the impression that he wasn't as smart and he was more of a salesman, but holy shit, he was incredibly intelligent, and a real thinker.