During the past week, we've been hit by some spam bots. I noticed on Sunday that the number of registered members on this forum was around 90. The users were all registered with random characters as usernames and their registered email addresses were clearly that of a spam bot. So, I decided to do some housecleaning and deleted all of our fake members.
We've also had some spam troubles on the home page with spam comments in the news stories. That has been taken care of as well. Fearing that a true "captcha" system would decrease the usability of our commenting system, I added a script that would require the users to type in "Nolan" before posting. Lucky for us, the spam bots are too dumb enough to realize this and we haven't seen a single spam comment since.