When I mouse-over a link, the destination URL is displayed in the bottom left corner of the browser window. This is very helpful in deciding whether I ought to follow the link. However, links to Youtube are the exception. Nothing in the URL indicates the name or the content of the video. I suggest an (optional) feature to show the Youtube video’s title as well as the destination URL.
Pro: Helps privacy and security conscious web surfers to decide which video links to follow. May help Youtubers as well as bloggers who link to Youtube videos and hope their readers will follow the links. (Could be extended to links to other sites with unhelpful URLs, too.)
Con: Prevents Rick-rolling.