Here’s a good way to add relevant content to your site and get a backlink from YouTube for doing so.
Embedding a YouTube video on your site will get a back link to your site from YouTube because they list the sites that are hosting their videos.
Here’s a Link Building Tip video from You Tube
Here’s the URL for the video, so go to that URL and see where it says “sites linking to this video” and you should see this blog post listed there.
Now, to make this work even better for you, you can create awesome site content by republishing quality articles from Ezinearticles.com then break up the content by interspersing video content, which will make the re-published content, which is duplicate content, more “original” in the search engines eyes..