What are some fun virtual websites

I recommend these:

Club Penguin.com
Dizzywood.com
Fantage.com
Minimonos.com
Ourworld.com
Freerealms.com
Webbliworld.com
Woozworld.com
Planetcazmo.com
Ecobuddies.com
Dinokids.com
KidsCom.com
Franktownrocks.com
Chobots.com
Smallworlds.com
Secretbuilders.com
Mydinos.com