When you see a post that's breaking the rules, report it, so that a staff member can take care of it.
The report post button(s) look like this:
on the Zuneboards 2 skin, and
on the default (Centura) skin.
Also, when you report a post, you can view the status of it, and see how it's been/being handled.
http://www.zuneboards.com/forums/postreports.php
To access your reported posts, go to quick links, all the way at the bottom.