Check out the following kid friendly websites:

3rd and Bird
ABCya.com
Alphabet Action
Avens Corner
Barbie
Boowa and Kwala
Discovery Kids
Fisherprice Games
Head Sprout
Jump Start
Kids Planet
Learning Planet
Lego
National Geographic Kids
Nick Jr.
PBS Kids
Peep and The Big Wide World
Peppa Pig
Playhouse Disney
Roary the racing car
Rupert Bear
Sesame Street
Seussville
Starfall
Story Place
Thomas and Friends
Tractor Tom
Underground Ernie