I thought I'd share this information, which I saw linked on Emily Giffin's blog (http://blog.emilygiffin.com/):
A company called Better World Books, that was started 8 years ago, has raised over $8 1/2 million for world literacy projects. They collect and sell used books online, and the purchase proceeds help to fund the global literacy projects.
Here's the company's website: http://www.betterworldbooks.com/
TIME magazine also has a blurb on it: Better World Books