Over the last few years I've done a number of talks that fall broadly under the umbrella of "History of Computing". Here are some videos for your enjoyment.
TEDxImperialCollege 2012: The Greatest Machine That Never Was
Computer science began in the '30s ... the 1830s. John Graham-Cumming tells the story of Charles Babbage's mechanical, steam-powered "analytical engine" and how Ada Lovelace, mathematician and daughter of Lord Byron, saw beyond its simple computational abilities to imagine the future of computers.