So the full length (a whopping 4 or so minutes, and a big chunk of that is credits) short film about Agent Coulson traveling to the site where Thor's hammer was found has been released online. I wanted to embed it, but apparently that option is disabled. It's pretty fun, even has a nice continuity nod for Marvel comics readers, but is really brief. You can see it for yourself at:

http://youtu.be/3tjwLv1VWrw