TEDTalks seems to be the West Coast equivalent of PopTech. It's own description claims: " Each year, TED hosts some of the world's most fascinating people: Trusted voices and convention-breaking mavericks, icons and geniuses." Given the speakers range from Jimmy Wales (Wikipedia) to Ze Frank to Oxford University's "Professor for the Public Understanding of Science.", you will find some great content which you can either watch as a webcast, or download for a podcast.
On a final note ... one needs an invite to attend the TEDTalks conference in person. It's not enough to just pay the conference fee. You have to prove you are a "thought leader".