(Sample link) NASA for high school students http://www.nasa.gov/audience/forstudents/9-12/features/index.html
(Sample link) National Geographic http://www.nationalgeographic.com
Classroom Connect http://www.classroom.com/inspire.jhtml;jsessionid=3SQFN115F5HOHQFICQFCM4Q?_requestid=5689
Microsoft Website http://www.microsoft.com