YouTube is now accepting video submissions for its Help Center. Now, users can help others learn how to use YouTube. Simply go to a Help Center topical page (find one that's super specific) and look for the box on the right hand side where you can submit a video.
Here's a screenshot of the page for "Sign-up and Log-in Issues: Unsolicited 'Reset Password' email"
YouTube is also enabling "Recent Activity" to be accessed through the API. The "Recent Activity" info appears on YouTube channels and lets viewers know what users have been up to lately.