Chatzy (http://www.chatzy.com/)
Need a quick way to chat with your friends? Here's a top-notch free service that lets you easily create your own chat room, in which you can invite people via E-mail to chat. No installation or registration is required and the service doesn't pester you with banner ads or popups.
Chatzy (http://www.ukchatterbox.co.uk/)
Here's a popular, lively free chat portal that has over 170,000 registered members worldwide. UK Chatterbox features moderated chat rooms, message boards, profiles, mailboxes, and more.
ChatCreater (http://www.chatcreator.com/) This service lets you have a quick chat room on your website/blog for free. Highly recommended by Team Wiki
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