I actually registered urlcomments.com for this purpose.
That way, people could have daringfireball.urlcomments.com, or maybe kottke.urlcomments.com.<p>I really wish kottke opened up comments on every post. When he does, it's quite spectacular. e.g. <a href="http://kottke.org/08/06/survival-tips-for-the-middle-ages" rel="nofollow">http://kottke.org/08/06/survival-tips-for-the-middle-ages</a>