This does basically the same thing as being in the SoWGB lobby, but it is outside the game. It is easier to use than the in-game lobby, runs in a window and doesn't make your computer as much slower while it's running. It's perfect if you want to be able to see who's in the lobby easily without having the game on.
It has a friends system, private chat, and other features. It also plays a sound when someone enters the room so you can be alerted while you're browsing the forum or doing whatever.
It is very straightforward to install and get into the SoW lobby.
Here's a screenshot of it in action:
