As we speak, Facebook is developing their own chat application, which may or may not allow communication over the Jabber/XMPP Protocol (we all hope it will though).
I, however, like several other nerds that probably exist out there, am trying to get a look at it first. And, I've gotten very close to succeeding, but I'm very far away. From the video, I discovered that the employee was using http://www.dev.facebook.com/ which is a special domain name, resolving to 10.1.100.106, and Internal IP address. Upon setting the IP to that of Facebook in my HOSTS file, I can manage to very slowly pull up a web page.
Anyone else have any further luck getting to the Development version of Facebook?