Check his TED talk on memes. Here is the blurb on the page:

Here’s one of those talks that can change your view of the world forever. Starting with the deceptively simple story of an ant, Dan Dennett unleashes a dazzling sequence of ideas, making a powerful case for the existence of “memes” — a term coined by Richard Dawkins for mental concepts that are literally alive and capable of spreading from brain to brain. On the way, look out for:
+ a powerful one-sentence secret of happiness
+ a compelling insight into terrorists’ motivation
+ a chilling view of Islam
And just when you think you know where the talk’s heading, it dramatically shifts direction and questions some of western culture’s fundamental assumptions.
This. Is. Unmissable.

Rather high praise for the talk, probably accurate. I didn’t experience it as being that ground-breaking, but I’ve been thinking about these things for a long time and have thought about pretty much all the things he touches on in the talk. Have a look, and let me know if you care to discuss any particular aspect of this talk. Let’s stick to the subject matter in this talk though, if you know what I mean. Certain digressions we so love making aren’t particularly useful.

UPDATE: For your convenience, the embedded video: