(Sample link) NASA for middle-school students http://www.nasa.gov/audience/forstudents/5-8/features/index.html
(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
(Sample link) Fun activities - by girls....for girls. http://www.missoandfriends.com/
King Arthur research http://medievaleurope.mrdonn.org/
Arthurian legend ideas http://library.thinkquest.org/04oct/01895/
King Arthur facts http://www.regia.org/village.htm
Arthurian facts http://www.castlewales.com/casterms.html
More King Arthur http://homeschooling.gomilpitas.com/explore/medieval.htm
More Arthurian facts on the legends http://www.chiddingstone-castle.org.uk/
king arthur information http://www.earlybritishkingdoms.com/kids/arthur_life.html
yet more information on Arthur http://www.earlybritishkingdoms.com/arthur/index.html
plus Arthurian http://www.missgien.net
another good site for Arthur http://www.timelessmyths.com/arthurian/index.html
more good places to look for Arthur http://www.factmonster.com/ce6/ent/A0856729.html
yet more on Arthurian legends http://www.britannia.com/history/h12.html