Here is a list of helpful websites for Reading, Math, and other subjects...
Reading:
http://www.starfall.com
http://www.readingeggs.com
http://www.internet4classrooms.com
http://www.funbrain.com
http://www.abcya.com
http://www.brainpopjr.com
http://www.cookie.com
http://www.readwritethink.com
http://www.gigglepoetry.com
http://www.earobics.com/gamegoo/gooeylo.html
Math:
http://www.coolmath4kids.com
http://www.multiplication.com
http://www.aaamath.com
http://www.funbrain.com
http://www.cookie.com
http://www.brainpopjr.com
http://www.connected.mcgraw-hill.com
http://www.primarygames.com/games.htm
Spelling:
http://www.spellingcity.com