I have been getting pounded with spam comments in the past couple of days, so I've turned on comment moderation. I turned off captcha verification months ago (I hate captcha verification), and didn't notice an uptick in spam at all. And then, for some reason, the spammers suddenly went crazy.
They are mostly the "buy apple iPad cheep" and "pharma pharma viagra now" sorts of comments, interspersed with random snippets about somebody else's post on sports or art or whatever, but one made me laugh. It said, "This used to be a really good blog." I so agree that this blog has seen better days that I almost clicked the link.