PBS Kids http://pbskids.org/
National Geographic for Kids http://www.nationalgeographic.com/kids/
Starfall Learning to Read http://www.starfall.com/n/level-a/learn-to-read/play.htm?f
Dr. Seuss http://www.seussville.com/
Rhyming with Reggie http://teacher.scholastic.com/activities/bll/reggie/index.htm
Kindersite http://www.kindersite.org/Directory/DirectoryFrame.htm
Funschool http://funschool.kaboose.com/preschool/games/index.html?trnstl=1
White House for Kids http://www.whitehouse.gov/kids/whlife/index.html