Here are some educational websites: 

www.starfall.com

www.pbskids.org

www.nickjr.com

www.ixl.com

www.cookie.com/preschool.html

www.abcmouse.com

www.abcya.com

www.fisher-price.com

www.peepandthebigworld.com

www.storyplace.org

www.literacycenter.net

www.scholasticcom

www.lil-fingers.com

www.kinderwebgames.com