One bit I really liked was his discussion on learning. He talked about how human beings have an innate learning mechanism through imitation. I've been thinking a lot about this recently as my 15-month old daughter is now reflecting back to us the words and signs we use to communicate. Jon emphasized imitation as a way to communicate new user experiences on the Internet.
He talked a bit about del.icio.us in this context. The social bookmarking concepts evolving from heavy del.icio.us users have incredible power and utility. Jon said, "del.icio.us has changed my personal productivity more than anything else in the last 5 years."
He went on to explain that the problem with wider adoption of del.icio.us is really about showing people how it works. He said, "People don't know what they don't know." Until you see someone else doing something that you didn't know about, you don't have any frame of reference for learning.
For concepts like subscribing to feeds or bookmarking with del.icio.us, you need really tight but very compelling stories that capture people's imaginations. One of the more interesting storytelling vehicles to appear in the last 2 years is a Udell invention of sorts called screencasting. His 'Heavy Metal Umlaut' screencast is the classic, the visual story that clarified to a lot of people, myself included, why Wikipedia is really something special.

Similarly, he brought up the example of the Microsoft iPod packaging video on YouTube and the ACLU Pizza video which both visualized incredibly rich concepts through very tight and highly entertaining stories. A screencast is worth a hundred MBA case studies.
Lots of thought-provoking stuff, as always. I particularly liked the fact that all of his seemingly tangential thoughts were in fact loosley connected. Just like the world he's evangelizing every day through his writing, his presentation swirled in one direction and another all the while routing in a random but purposeful direction back to the start.
http://www.ipodobserver.com/story/25957