Open Culture:

Download hundreds of free audio books, mostly classics, to your MP3 player or computer. You’ll find great works of fiction, poetry and non-fiction, by such authors as Twain, Tolstoy, Hemingway, Orwell, Vonnegut, Nietzsche, Austen, Shakespeare, Asimov, HG Wells & more.

I’m not a huge fan of audio books but I know I’ll be listening to the Asimov’s “Nightfall” and “The Foundation Trilogy” on my next 24-hour flight to Australia.