I enjoy watching videos via the official TED app every once in a while. I’m especially a fan of the “Inspire Me” section, which lets you pick videos from categories such as “Persuasive” and “Informative”, further specifying how much time you can dedicate to a video.

For iOS 7, the TED app has been redesigned to have a cleaner look that focuses more on video thumbnails and descriptions. It’s not revolutionary in terms of design, but it’s still TED, and free on the App Store.