If you have already seen the movie but you didn’t wait till the end of the credits check out this vid. If you haven’t seen the movie please note this is a big spoiler.
The end scene shows Dr Erik Selvig meeting Nick Fury somewhere underground. They discuss another possible power source to repair the bridge to Asgar. Fury reveals *drum roll* The Cosmic Cube. Then Loki appears in a glass reflection next to the doctor and appears to be controlling him.
Please excuse the poor quality of the vid. Its the best I could find.
http://www.youtube.com/watch?v=JtFaHNv1_Cw&feature=related
As suspected after the last Iron Man and The Incredible Hulk there will be an Avengers movie. We will post that story soon.