A few good resources on Native Americans are Encyclopedia.com, Native-Languages.org, History.com and Indians.org. These four sites research the information and History offers a fact check for their page.
Native-Languages.org uses kid-friendly language and a question and answer format. It includes pages with general information about Native Americans as well as individual tribes.
History.com offers a page on Native American Indians that includes videos and clips that have been shown on the History Channel.
Encyclopedia.com features researched facts and has pictures available to view, with dates and sources.
Indians.org is a non-profit site with information about tribes, traditional Native American products and other topics.