Moderated Chat room

Interlaced and moderated are the tough words…

You might look at http://www.craftysyntax.com. It, and other chat software, can generate HTLML code you can place in your sidebar.php (or widgets) to ‘kick-off’ a chat session.

There’s also something like Gabbly Chat listed along with other widgets:
http://codex.ww.wp.xz.cn/Plugins/WordPress_Widgets

Also Jalenacks Wordspew:
http://blog.jalenack.com/ajax/