Native Web has Resources for Indigenous Cultures around the world, they also have a wiki set up.
Index of Native American Resources on the web is a virtual library. Use common sense when viewing individual links for accuracy and authenticness. The website does a great job of including such a diverse collection of links. It is a great starting place.
Bureau of Indian Affairs website. This site has some good information that you might want to compare and contrast to as you and your students explore current news found in other locations.
The Native American Radio service is a resource worth exploring.
The Native American Voices Radio Program great resource for audio learning.
The Native Voice is a newspaper out of Colorado. You can currently register free to read the newspaper.