Well, I was hoping that we would not have to do any anti spam stuff but unfortunately the bots found us and started advertising all manner of unwanted garbage. As a result I have implemented an extremely simple method to stop spam: commenters need a password. For now we have one password for everyone, which we will send out in email internally. (Any external readers feel free to request it!). If this doesn't work (for whatever reason!) we can go to the next level with jpg decoding, IP banning, etc.