The way it'd work is simple. A single thread presenting the ladders to choose from would be started. Any player wishing to add a new game & ladder to the thread need only post the request. The requesting player would hold top rung, until they are un-seated by a joining player.
So for example if I were to start one, it may look like this:
Company Of Heroes 2 1v1: Mode- Point Capture
3.And so on
If some one wished to add one, it could look like this: (Luc being the one who started the ladder, gets top spot. After its in the order who joins until players become un-seated).
Age of Empires II 1v1: Mode- Conquest
There would of course be some general overall rules displayed regarding forfeits, connection loss, missed matches, map choice etc.
It would be something meant to encourage some friendly competition in a laid back setting.
Would be interested to hear thoughts, and displays of interest. Even though it could begin with as few as 2 people.