AJAX Web Chat Tutorial
I have been working on a tutorial to explain how to create a web chat application using AJAX technologies.  I'm almost finished with the client site tutorial, and I'll be starting the server side tutorial soon.  You can find the AJAX Web Chat Tutorial here,  and you can find an example of the tutorial application here

I will be working on this application in the comming months, so stay tuned to see it's progress and view the new tutorial information.