I Am Mixed by Garcelle Beauvais and Sebastian A. Jones, illustrated by James C. Webster (Strangers Comics, 2013).
This is a great book about a brother and sister who are of mixed race and whose parents have different cultural backgrounds, and how the siblings are the best of both. The book has some impressive blurbs from celebrities like Halle Berry and Heidi Klum, and was written by two actor/authors.
I found the story to be imaginative and fun; I think it would really help mixed kids with seeing themselves represented in a book and to feel proud of who they are. My only reservation is one aspect of the illustrations. There is something unsettling about the characters' eyes in many of the pictures; they remind me of dolls', but more in a creepy than cute way. Maybe kids wouldn't notice, or just it's me, I don't know. But it's too bad because I do feel that it detracts from my love of the story itself.