You may be into superhero comics, action movies or Norse mythology we will cover it and help you learn more about it in this post. The movie Thor which came out today, May 6, 2011.
You can read the comics in 3 volumes all offered at amazon.com.
So there are the comics and movie, but what about the real mythology? There is a lot to learn there too. Start here with the wikipedia article. If that is not enough you can learn more from these books: