CaFamily.org - AJAX Chat application

We're currently busy writing an AJAX based chat application for http://www.cafamily.org.uk; it's based on Mootools, Propel (and PHP5) . We're hoping to make it available as a standalone Open Source application in the future.

It's aimed at primarily an "ask the expert" chat session, where a number of users will ask questions and a moderator will approve questions in an appropriate order for an expert to answer.