Starfall http://www.starfall.com
Enchanted Learning http://www.enchantedlearning.com
Primary Games http://www.primarygames.com
Funbrain http://www.funbrain.com
Just for Kids - includes The Adventures of Herman http://www.urbanext.uiuc.edu/kids/index.html
Scholastic http://www.scholastic.com
PBS Kids http://pbskids.org
Treasures - Grade 1 - Books 1-5 http://activities.macmillanmh.com/reading/treasures/
MightyBook (username=isd12, password=book) http://www.mightybook.com/members/index.htm
Funschool http://funschool.kaboose.com/index.html