I think Club Penguin is my favourite because it helps you meet new friends on-line and you can sign up for free!
Here are some links:
Play
Front Page
And to get a free penguin follow this link and click 'Don't have a penguin? Create a free account now'.
Play Club Penguin Free

Visit other pages in this website abput Club Penguin:
Membership in Club Penguin,
Games on Club Penguin and
Funny Pictures from Club Penguin.