There isn't much by way of admin tools. Basically what the admin can do is block content in various ways: http://i.imgur.com/bmQXByS.png. Beyond that you're expected to rely on the Arc commandline, or to manipulate the files created under anarki/www/news.
Ah, I just remembered seeing various special pages just for admins in news.arc. For example /badsites seems to show sites that have been nuked in the past.
