Hi Nima,
I was wondering if you've made any improvements to the security of the chat applet during your work. I've had a quick play with the PostgreSQL port of the original acs-chat module and identified a couple of issues with authentication that I'd need to resolve if I was to use this. I couldn't check this against your version when I tried earlier today, I guess you're not still keeping the server up.
Cheers,
Tom