I'm sorry to say that I've decided to turn on comment moderation for my blog for the time being. I'm finding that I have to spend too much time deleting advertising spam comments, and I think it will take less time for me to approve valid, on-topic comments than it will to delete the advertisements. That means there will be a slight time lag if you post a question or comment about my blog posts, but I will publish all comments that I receive that are related to the topics I blog about and are not just click-through links to advertisers' websites.
If the spam comments taper off and/or my blog server gets better about filtering them out, I'll turn moderation back off. Hopefully that will happen soon. In the meantime, I apologize for the inconvenience.