I really like the company Better World Books. They are an amazing example of social entrepreneurship - they sell used and new books, they donate a portion of all their proceeds to worldwide literacy organizations, and they are always looking for ways to be more socially and environmentally responsible.
The are currently seeking a grant, in conjunction with the National Center for Family Literacy, of $250,000 from the Pepsi Refresh Project to hold literacy events in at least 200 communities, get families reading and learning together, help struggling schools raise money, promote family literacy and get 1 Million Children's Books in the hands of kids nationwide.
This is in no way an endorsement of Pepsi, but hey, if we can get some of their money working for children's literacy, I say let's do it!
Vote for Better World Books here.