I thought about that, but my experience with the
Video Game Babes wiki I also run is that requiring registration HEAVILY retards participation. The project might never get off the ground if people have to register/login AGAIN separately from the board.
There have been a few anonymous editors (the first of which was clearly Shannow creating his own page about himself, as is proper), and so far nobody's done anything untoward. At this point I think our best option is to continue to let anonymous contributions, until somebody ruins it for everybody, at which point it's a simple flip of the switch for me to change it to where only registered users can edit/create.