As you know Facebook.com launched Facebook messenger for Windows. It looks cool and you can chat with up to 5000 friends. Messages are kept the same as normal chat or just like normal messages on Facebook servers, and you can see the activity of friends in a window that does not depend by a browser. In the right part bottom of program they put a button wich dock in the right side of screen and looks like in the browser.
On the top you can see: Friend requests, Messages and Notifications.