Dressupwho.com/fashion
Clueless
a good football website 4 kids is the AFL website.
Girlsense.com is good for any age, though as of July 18th, 2012. Girlsense shut down, the only other websites i have even heard of for fashion designing is FPGirl.com, but i don't think they have as much freelance designing.
There is coolmath kids can learn things on that educational website
starfall.com is a good website for kids under the age of 7.
Kids world .com
Webkinz.com is good for kids but you have to buy it first. and free realms and evony
studentsoftheworld is a really good site for kids to have penpals.
My friends have this nice website called chicflavor.com, its pretty cool :D
primarygames.com
venicoo
Familyfun.com