Bestselling classics and the public domain

The Shifted Librarian has a post reviewing Book Magazine's list of the bestselling classic novels of 2002. Per the Shifted Librarian's request, Eliot Landrum enhanced the list to reflect each book's public domain entrance status. The Great Gatsby will enter the public domain in 2020 if F. Scott Fitzgerald's estate doesn't file for an extension--but of course they will! Right now I'm trying to imagine works of literature, postmodern literature and any other 21st-century literature that isn't "postmodern literature," that are being inhibited right now by practically-perpetual copyright laws. Gah.

As an addendum, I have to wonder about Book Magazine's definition of "classic." The Red Tent by Anita Diamant is on there, which is a very new book (other newbies are on there too). Don't get me wrong; I loved the book and really think you should read it if you haven't, but is it already considered a classic? I'm proud to point out that The Red Tent is a brilliant derivative work of a public-domain text: the Bible.