Still working on the next part of the tutorial but in the meantime this is something that folks should know about. Subtitles and captions are not just for deaf folk or speakers of 2nd languages.
It can also be used to provide a means to search for content in some of the search engines. Subtitling software can be dicey or clunky but there is a new project by Mozilla and the Participatory Culture Foundation to bring about a better way for all of us to have subtitles.
Check out the video where Caro explains the project and what you can do to contribute.