XCorvis
First Post
Well, the threadbumping helps. 
You might post some threads on various gaming message boards asking for feedback on the site. If you just posted "join the d20 NPC Wiki" some might consider it spam. If you ask for feedback, you can get people to look at the site and get interested without actually begging them to join. Plus, you might actually get good feedback. Make sure to toss in a line about "anyone is welcome to join" and that kind of thing.
I'd try RPG.net, here (of course), WotC boards. I'm not too familiar with other RPG message boards...
You could also try a drive of some kind, like a membership drive or an NPC drive, where you try to get 100 new NPCs in X days. (I kind of like that idea.) Then it can get some news coverage on the front page here, and might get picked up in other gaming news areas.

You might post some threads on various gaming message boards asking for feedback on the site. If you just posted "join the d20 NPC Wiki" some might consider it spam. If you ask for feedback, you can get people to look at the site and get interested without actually begging them to join. Plus, you might actually get good feedback. Make sure to toss in a line about "anyone is welcome to join" and that kind of thing.
I'd try RPG.net, here (of course), WotC boards. I'm not too familiar with other RPG message boards...
You could also try a drive of some kind, like a membership drive or an NPC drive, where you try to get 100 new NPCs in X days. (I kind of like that idea.) Then it can get some news coverage on the front page here, and might get picked up in other gaming news areas.