TED is a conference in which really interesting people present short (usually about 10-20 minute) talks about whatever their area of expertise is. They're usually educational yet entertaining. I watch an occasional video now and then, and I usually learn something new.
You can't actually attend the conferences, unless you have $6,000 burning a hole in your pocket. Also, there's an application and invitation process to go, even if you had the money lying around. But, they post all the content online for free, so who needs to sit in the room anyway?
As a sample, here's an interesting proposal that complex scientific ideas should be taught through dance, rather than PowerPoint.