OK, OK, so before I said I didn't believe in comments ... but I guess they have a time and place. Like a blog that gives code examples. I have to admit that sometimes it is nice to see some point clarified by the blogger to some reader's question, but for the most part, I still think they are not so useful.
As a compromise, I decided to enable comments to posts, but you'll have to verify that you are indeed a real-live person with captcha for each post.
Also if you do have a blog, or have something more substantial to add, I prefer you post comment on your own blog and use blogger.com's "link to this post" back-link functionality. I think this would make for a better conversation and also increase google scores ;)