Single best is difficult, here are some favourites of mine: "You and your research" by Richard Hamming: http://www.youtube.com/watch?v=a1zDuOPkMSw http://www.

Single best is difficult, here are some favourites of mine: "You and your research" by Richard Hamming: http://www.youtube.com/watch?v=a1zDuOPkMSw http://www.youtube.com/watch?v=a1zDuOPkMSw "How to design a good API and why it matters" by Joschua Bloch: http://www.youtube.com/watch?v=aAb7hSCtvGw http://www.youtube.com/watch?v=aAb7hSCtvGw Google TechTalk on Git by Linus Torvalds: http://www.youtube.com/watch?v=4XpnKHJAok8 http://www.youtube.com/watch?v=4XpnKHJAok8 All talks ever given by Alan Kay, for example: http://www.youtube.com/watch?v=oKg1hTOQXoY http://www.youtube.com/watch?v=oKg1hTOQXoY