ahh i'm excited thor is my favorite!. i hope it's just rumor that brad pitt is playing thor, he's kind of getting old. i'd rather them cast an unknown actor for the part.
So with the Thor movie, obviously its a hint of an Avengers movie coming. Tony Stark as Iron man (Robert Downey Jr) or Bruce Banner as Hulk (Edward Norton) could ask Thor to join the team. Captain America is being planned for release in theatres 2011.
I think Captain America would be the leader of Avengers while Nick Fury (Sam L. Jackson) is the founder behind Avengers.