Here's a great resource -- Talk Story, a website with an awesome list of children's books focusing on Asian American Pacific Islander characters and culture. The list is broken out by different countries/cultures, including Chinese & Chinese American, Taiwanese & Taiwanese American, Cambodian & Cambodian American, Korean & Korean American, etc. These lists are further broken down by type of book -- picture book, chapter book, young adult, etc. There's also a great list of American Indian/Alaskan Natives books.
Thanks to Kimchee Mamas for the link!