You may or may not have noticed that I’ve turned off comments on posts older than three months. I wasn’t getting tons of spam comments (spamments?)—I suspect my filtering was working well enough—but I was certainly getting tired of the ones that were coming through. Since they were almost invariably on old posts, I finally bit the bullet and took care of the problem.
If you have a burning desire to write about a past blog entry, just use the contact form. Of course, that’s no guarantee that you’ll get anywhere.