22 Frames is a website in beta version that aggregates captioned videos. The site was initally to service those with various hearing abilities, but they are also interested in helping those trying to learn English through the use of captioning.
The site also includes English Learning Activities.
According to the website,
"We've been busy building some of the features that many users have emailed us about. The first ones we are releasing can help you use videos to learn and teach: commonly mispronounced words, idioms, and slang phrases. We processed thousands of videos and found ones that illustrate these kinds of phrases. On each page for a video that uses a phrase we provide menus that will even take you to the approximate times the phrases are spoken. Watching an entire video is not necessary. "
http://www.22frames.com/