The blog, American Indians in Children's Literature, by Debbie Reese (professor of American Indian Studies at UIUC and enrolled member of Nambé Pueblo) is always worth a visit. If you follow her links to further discussions, suggested resources, other blogs, etc. (and then on to the links you find in those places) you can keep thinking about what children read and see, and what effects it has on them, for a long time.
Sometimes we have the books she recommends (and sometimes the ones she doesn't recommend); sometimes not. Often we use her suggestions to put books on our shopping lists. But she's always thought-provoking.