Comment spam has gotten out of control. I was getting around 200 per day that I had to go through and delete. To not deal with it for a bit, I’ve disallowed comments from unregistered users which I realize means most people will not comment. I just didn’t want to spend much time on it right now and at some point I’ll look into the various ways others deal with it and see if one of those will work for me. In the meantime, please feel free to contact me via the contact form.