This one is an older presentation now (from 2006) but David Pogue, The NY Times Tech. columnist makes this one upbeat and funny while staying on topic and poignant to boot. Love the songs too for humour – Good stuff !
New York Times columnist David Pogue takes aim at technology’s worst interface-design offenders, and provides encouraging examples of products that get it right. To funny things up, he bursts into song.
David Pogue is the personal technology columnist for the New York Times and an Emmy Award-winning tech correspondent for CBS News. He’s also one of the world’s bestselling how-to authors, with titles in the For Dummies series and his own line of “Missing Manual” books.
http://www.ted.com/talks/view/lang/en//id/7