These were some very interesting articles from listservs I follow.
Salon: #WeNeedDiverseBooks goes viral
Lee and Low Books: Where Can I Find Great Diverse Children's Books?
New York Public Library: Celebrating Diverse Children's Books: These Stories Dazzle and Reflect
NPR - New Initiative Aims to Encourage Diversity in Kids' Publishing
Teen Librarian Toolbox: Dear Media: Let Me Help You Write That Article on YA Literature
Anne Ursu: On 'The John Green Effect,' Contemporary Realism, and Form as a Political Act
Zetta Elliott, The Huffington Post: It's Not Me, It's You: Letting Go of the Status Quo
There is also a great list of Native authors and illustrators by Debbie Reese at American Indians in Children's Literature, and this is the link to her WeNeedDiverseBooks post.