I have read "What Are You" but didn't have a copy of my own. I especially like this book. It's geared more toward young adults, too, which makes it a perfect addition to your bookshelf if you have biracial children, but this book deserves its own post, later.
"I'm Chocolate, You're Vanilla" is a parenting book for parents of black and biracial children (I'm assuming only biracial children of African American decent, but I don't yet know), but I include it here because it's been long regarded as an excellent book on parenting.
My bookshelves are generally arranged by topic, and much of what I have is shown below.