This article is a couple months old, but I just ran across it today, and I love it:
29 Awesome Books With Strong Female Protagonists
I love me a good book with a strong heroine, and this list has some of my all-time favorites, such as Jane Eyre, From the Mixed-up Files of Mrs. Basil E. Frankweiler, and The Island of the Blue Dolphins. I was a bit disappointed that Phillip Pullman's His Dark Materials wasn't on there, because Lyra is one of the strongest and most defiant female characters I have ever read about, but I guess there are plenty others that didn't make the list, too.
I also would have put The Tenant of Wildfell Hall on this list. It's not only my favorite of the Bronte sisters' books, but it also, I think, is one of the strongest of all of their characters. She's not fiery like Jane Eyre, but she quietly defies every expectation of women by running away from her alcoholic husband -- with their son, I might add -- and supporting herself with her artwork.
Who are your favorite heroines?