Mobento is a new site that lets you search for words spoken in videos. For now, they have indexed ones from Khan, TED and Stanford, and plan a lot more.
It’s pretty straightforward — you type a word into the searchbox, and it shows you the videos where it has appeared. click on the video, and under the screen there’s a mark where the word is spoken. Click on each mark, and you hear it and its context.
It could be useful, especially as they expand their collection.
You can search the videos without registering, but have to sign-up if you want to leave a comment.
Thanks to TechCrunch for the tip.