Need proof that book challenges backfire?

• From the Lexington Herald-Leader:

Since the conservative Catholic League and various evangelical Christian groups began cautioning parents through newsletters and e-mail three months ago, the series has seen a 500 percent increase in sales, according to Reuters, though much of that surge can be attributed to the movie.

• Remember the Sandpiper challenge?

From the Tuscaloosa News:

The Tuscaloosa County School Board has yet to decide whether the book "Sandpiper" should be kept on the library shelves — but four copies of the book are now in circulation at Brookwood High.

And they've all been checked out.

How does it work again?  Oh, right.  Banned in Boston, automatic bestseller.