I've had comment moderation on for years, thanks to a couple real jerkwads who insisted on polluting the blog. But I've never had much problem with "blogspam," comments full of advertising and links to crapsites, and I just rejected them. I got maybe one every other week.
Yesterday, all of a sudden, I got twelve, and it's continuing today. So I'm considering adding CAPTCHA tech to the comment field; that thing where you have to type in the 'word' you see in a window before your comment will post. I don't want to do this -- it's a pain in your neck -- but neither do I want to have my time sucked up by rejecting a bunch of "Miley Cyrus NUD!" spam, you know?
So...will having to do that one extra step be a real pain in all your butts? Or is it no big deal? Let me know, and I'll factor that in before I decide. And who knows, this may just be temporary.