Mike Chambers have put up a nice little chat application on his weblog – lets just call it mesh on MX chat (look on the top of the page). Its based on Flash Communication Server components and the server itself (of course), with hosting from MediaTemple. I hope other hosting companies will be able to make deals resembling those that MT must have gotten (Yes, I am talking out of self interest here).
The chat showcases a weakness of the components (I think), at least the chat does not seem to multitask very well at the moment. There is a lag when trying to type everytime a message is coming in. I am sure Mike will be working on fixing that little problem.