Reading Target - This has an excellent review and practice system for all phonics skills. It would be very helpful for you to have your child practice areas where you notice errors in spelling and reading. http://www.readingtarget.com/
Fact Monster - Good way to explore and practice math skills. http://www.factmonster.com/
Read about your favorite author or even write to him or her. http://www.kidsread.com
National Wildlife Federation has interesting activities for children if you click on the Kids section. http://nwf.org
Learning games - Check out the spelling games. http://www.harcourtschool.com/index.html
Fun learning games http://www.primarygames.com/games.htm
Great science games and quizzes http://www.bbc.co.uk/schools/scienceclips/ages/7_8/magnets_springs.shtml
http://www. pge.com/microsite/PGE_dgz/wires/game.html
http://www.engineeringinteract.org/resources/siliconspies/flash/concepts/electricity.htm
http://www.engineeringinteract.org/resources/siliconspies/flash/concepts/simplecircuits.htm
http://www.bbc.co.uk/schools/scienceclips/ages/8_9/circuits_conductors.shtml
Social Studies http://www.lizardpoint.com/fun/geoquiz/worldquiz.html
http://www.quia.com/cb/14762.html
http://www.maps101.com/static_items/games/MapsPuzzle.html
Word Study Flash Cards http://www.quia.com/jg/66105.html
Contraction Web-sites which can lead you to activities and practice with other skills as well. http://www.manatee.k12.fl.us/sites/elementary/palmasola/contractions.htm
Learning Games http://www.playkidsgames.com/problem_solveGames.htm