The NPC site was getting a fair bit of spam--mostly dealing with World of Warcraft gold--so we've decided to install Mollom to the site. Mollom is a spam catching service that will try and determine if your comment is a) spam, b) could be spam, or c) is spam and it takes appropriate action ranging from nothing, to a captcha challenge, to blocking the content.
Let me know at matthew [at] dogstar [dot] org if you see anything strange. Otherwise, happy posting!
If you are interested in how to install Mollom on a Drupal website, I have put together a short tutorial on my Nonprofits and Web 2.0 Site.
Creech Antwerp / Matthew Saunders