Starfall http://www.starfall.com
Math Games http://www.apples4theteacher.com/math.html
NTCM http://illuminations.nctm.org/Activities.aspx?grade=1&srchstr=
National Geographic for Kids http://www.nationalgeographic.com/kids/
Frog Crafts http://www.enchantedlearning.com/crafts/frog/
Yahooligans http://yahooligans.yahoo.com/
Harcourt http://harcourtschool.com/index.html
Magic School Bus http://place.scholastic.com/magicschoolbus/index.htm
Cyberkids http://www.cyberkids.com/
Berenstain Bears http://www.berenstainbears.com/
Arthur http://pbskids.org/arthur/
National Library of Virtual Manipulatives http://nlvm.usu.edu/en/nav/vlibrary.html