I love good speakers. It almost does not matter what they are talking about. Good speakers are a joy to watch in action. The best video of good speakers can be found on the TED website. The event just happened, so there is at least a year of new material up there for you to absorb.
If you need convincing, check out this post by Robert Scoble who just attended the event.
Don't just pick the talks that are on subjects you are already interested in. I have never been to TED, but I do attend many events and I always come away with the benefit of something I did not intend to learn.
So carve off 30 minutes and throw a dart a the TED web site and feed your brain.