Trailers Weekly: Don’t Be Afraid of the Dark, Jackass 3D, Unstoppable, and I Spit On Your Grave Dan Koelsch, August 7, 2010 Trailers Weekly is a feature in which we bring you the most popular and talked about trailers of the week. Sharing trailers is a classic viral practice, and trailers are still the most mainstream way for people to learn about movies. This week we have the first teaser for Guillermo…