Hm. Some comments have been hidden in the "Waiting Moderation" section of the blog. And they are hidden. Finally found one today.
Also, Google has buried some comments in the "Spam" section. And they are spam. But still:
"What a material of un-ambiguity and preserveness
of precious knowledge regarding unpredicted feelings," posted as a comment to a Pike Place post.
I almost agree.
Alas, a Google search reveals that this message has been posted to a great many other blogs, blogs that apparently have not enabled a spam filter.