Have you tested LinkedTube?

I just discovered a cool free and easy way to embed overlay links onto YouTube videos. ? LinkedTube is a very simple and smart flash widget that enables you to create clickable links on your YouTube video with your own embed code.

The link looking like a floating button over the video on the right hand side and can be used to link directly to any site on the web like your blog, website or an affiliate link. This way you can transform any YouTube video into a useful viral promotion tool.(With a standard YouTube player it is not possible to embed links in to the video itself.)

Take a look at LinkedTube and see how this video widget can help you in your online marketing.