(Sample link) White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
Ms. Rawl's Page http://northforestpineses.wcpss.net/computers.htm
Starfall http://www.starfall.com
funbrain http://www.funbrain.com
Books by Level http://home.comcast.net/~ngiansante/index.html
Rainforest math http://www.rainforestmaths.com/
Littlefingers http://www.little-g.com/shockwave/loading.html
That's a Fact! http://www.harcourtschool.com/activity/thats_a_fact/english_K_3.html
Junie B. Jones http://www.randomhouse.com/kids/junieb/
Your Neighborhood http://bensguide.gpo.gov/k-2/neighborhood/index.html
Seussville http://www.seussville.com/
Study Island http://www.studyisland.com
Eagle Cam-Iowa http://www.ustream.tv/decoraheagles
Google search for books by reading levels (basic, intermed., advanced) http://www.huffingtonpost.com/esther-wojcicki/teachers-try-this-new-goo_b_858656.html
Books by category http://www.the-best-childrens-books.org/