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Better World Books collect and sell books online to donate books and fund literacy initiatives worldwide. Every time you buy a book someone else in need gets one.
In addition to selling new titles, Better World Books supports book drives and collects used books and textbooks through a network of over 2,300 college campuses and partnerships with over 3,000 libraries nationwide. So far, the company has converted more than 117 million books into over $15 million in funding for literacy and education. In the process, they’ve also diverted more than 73,000 tons of books from landfills.

I know where I am donating my books to from now on. They even pay for shipping! Awesome!