Kid Research:
http://kidgrid.com/
http://www.yahooligans.com/
http://www.askjeevesforkids.com/
http://en.wikipedia.org/
http://www.historyforkids.org/
http://encarta.msn.com/encyclopedia
http://www.aolatschool.com/students

Challenge Your Brain Websites:
Math Races: http://arcademicskillbuilders.com/
Fun Problem solving: http://inventionatplay.org/index.html
Make a Comicstrip: http://www.makebeliefscomix.com/Comix/
Operations: http://www.edheads.org/
Videos: http://www.neok12.com

Homework Helpers :
http://onlineintervention.com/OI/homeWork_anon2.jsp