I have enabled the feature to leave comments to a particular post. However these comments will be screened before they are posted. Which means that you can make a comment, but it is possible it won't show up for a day or two. Or if the comments are inflammatory then they won't be posted at all. The idea of the blog is for information and not for banter.
If the comments are abused then we'll switch back to the previous settings. I'm hoping that as people have questions they can respond via the "comments" instead of sending an email. Then I can respond to the comments so that people can get the information they are looking for.