bbPress.org

Marius- when I am using 1.0.2, and I view the profile of a user when logged in as keymaster, I have a “Delete User” button on the bottom of their profile page. Do you not have that? That’s how I delete a user if I have to (which almost never happens these days.)

Screenshot: http://twitpic.com/11zdpu/full

In addition to deleting them, you could just set their status to “inactive” as well, also on their profile page.