I Can, Can You? Written and photographed by Marjorie W. Pitzer. ISBN 1890627577 (board book)
Although this book was mainly put together for babies and toddlers (and six year-olds learning to read), it's a great book for adults to look at and think about. Every page is a photograph of a young child with Down's Syndrome doing everyday activities, like playing, swimming, and even learning sign language. Anyone who doubts the human worth of such kids has a greater congenital defect than they, Peter Singer.