Canadian Teen Study Hall (with links to sites around the world):
www.questtech.ca/homework/teenstudy.html

Canadian Information by Subject: 
www.nlc-bnc.ca/caninfo/ecaninfo.htm

High School Hub: 
www.highschoolhub.org/hub/hub.htm

Homework Help: 
www.startribune.com/education/homework/shtml

United Nations InfoNation:
www.un.org/Pubs/CyberSchoolBus/infonation/e_infonation.htm