Gigau's probably the most active of us. I talked about writing a blog a long time ago and getting someone like him to post it, but I disappeared for ages and I'm only back now.
That's an over-exaggeration Najs. There are plenty of forumites, perhaps hundreds, who frequent the OT and haven't heard of werewolf (least not properly). What harm could an advertisement thread do? Obviously in the other forums there's more numbers but the OT is the only one we can get away with blatant advertising in. I really think more blogs could increase awareness. And the signature is the easiest thing to do.
Lastly, we could try and recruit more players from other forum games here.
That's how I got here
Everything mentioned here will help, but only slowly and not in a way possible to measure, really.
I still say a thread in the OT, with a punchy yet descriptive title, and a powerful, stand-out, detailed and concise first post, could get us at least a dozen new players trying werewolf within the year easily. A really comprehensive guide to the game I'm talking about.