The teaser trailer for Jon Favreau's Cowboys and Aliens has been released.
Yahoo! Movies: Cowboys & Aliens (2011)
This is how you make a trailer; you introduce the main characters andyou do not show off the big reveals. Notice they did not show us the aliens. For a film that could have been really goofy, they seem to be instead making a serious film. A film that will treat the western and sci-fi genres well.