Maybe it's just me, but instead of individual series why don't you just put a genre forum??? With all the 'new' anime coming out all the time it's going to be pretty hard to please everyone. But no one really wants to post in 'other' because it would be pretty stupid to have to browse around so many different titles. If it were done by genre then at least you would know that you'd be able to find posts about your series or maybe even find other series that would interest you.
OR maybe set it up like Mangafox forums?
I really wanted to post something about the Wallflowers/ Perfect Girl Evolution anime...but it seems pretty dead in the 'others' group. Not to mention that discussing things about a genre gets lost in the "Anime chat" group but doesn't fit in the anime, series or spoiler talk sections either.