I *love* Amy Adams and her hair. When I heard she was going to play Lois Lane I was afraid they'd either dye it brown or make it short, both of which would be tragic. I'm glad they didn't.
If you like her hair, it's totally worth watching all of her movies except Julie Julia (short hair, may or may not have been a wig--I'm bad at telling), Doubt (plays a nun and you never see her hair), and Miss Pettigrew.
Enchanted and Trouble with the Curve are particularly good for her hair.
Also, if you like Amy Adams, check out Isla Fisher too. Similar face; similar hair; less "good girl" look. Wedding Crashers and Confessions of a Shopoholic are a good place to start.