It was announced in 2008 for a tie-in release with the movie. I haven't heard anything about it since. Are they still making it? I really hope they are, Thor is my favorite superhero.
Also, how would you do a Thor cartoon? How would you do your pilot episode? What would be the (if any) major storyline going across the entire first season? Would you have the origins explained in the first episode(s) or would have some sort of origins episode?