The Poppenkast is an indie experimental game developer collective whose members include such influential figures as cactus, messhof, and radnom (maker of the incredible Gunlimb which scored #2 in the TIGSource B-Game competition). And apparently they're doing a 3-hour game jam thing now! It might even be... monthly! (Downloads here and here.)
It appears to be much like our Earth KotMK, with the following differences:
Instead of 2 hours: 3 hours.
Instead of Klik & Play: GameMaker.
Instead of everyone making their game at once: Everyone spends their three hours sometime within some deadline (looks like it's usually around a two week period).
Instead of Six making crazy-brilliant conceptual mindfucks: Cactus does it (I assume).
I am pretty tempted to get in on this action! The latest competition is on until the end of July and is open to whoever!