It would be AWESOME if on each video there was a link (or dropdown menu) to watch the video in another language. Once another language was selected, maybe Khan could redirect you to the selected language's version of the same video? 

For example, I know I can go to the Khan website that is in Spanish, but it sometimes takes me a while to find the same video. It would be nice to just go to the English version and then select the Spanish version from there :)