I know what you mean. Good thing I hosted 3 mafia games back to back to back before this happened. Now I'm back of the list. Or am I? Maybe I'll quickly jump ahead to the front of the back with my next mafia idea. I think it would be very interesting.
I'd also raise a counterpoint to Pale's suggestion that the sign-up thread would have to start in the Funhouse. If the Funhouse can change the name of the Forum to Hungry Hungry Hippo Strategy Forum, then I see no reason why the Mafia Forum can't change its name to advertise the latest upcoming game. Just change it to: "New Mafia Game (starting date, I.E. Feb.1, 2009). Sign-Up Today." And then underneath it, you could even mention "Sign-up Thread Inside. Theme:________ Hosted by:_______" And that way, you get the maximum coverage for the game without having to stick the sign-up inside another forum. It will actually be announced on the list of Forums. One of the first things people will see when they come to the forums.
But alas, I am not moderator of that forum. I can only dream. And campaign hard. Annoyingly hard. That's what I'm good at.