Awesome concept and I think it has some potential to evolve but for now I see two problems. 1) The motion makes it too distracting from other page content (at a sub-conscious level) so you may as well just have a blank pages with the action item as nothing else can be consumed. 2) If you're trying to use the arrow to identify the real action item on a page littered with ads, this will just make it look more like an ad.
Cool idea, but at least for me (2012 13" MacBook Air), scrolling smoothness suffers slightly (yet noticeably).<p>I wonder how it performs on iOS/Android devices?
It's the blink-tag form of a CTA.<p>Also, inevitably there will eventually come a need for an orange one pointing to their how-to video. "Don't forget to sign our guestbook!" "Also, this other thing is kind of important." Just use better page design rather than greebling your existing one.
Rather than use this do the call to action, a better usage for me would be a 'help mode', user clicks help and a wucik walk through of functionality is presented using these arrows to draw attention to some area of the screen.