A spam spider hit my blog a few minutes ago, leaving a cloying remark ("Very pretty site! Keep working. thnx!", or "Your site is on top of my favourites - Great work I like it.") on each post, with a link to some casino semi-visible underneath the butt-kissing (so I won't delete the comment, which I will, of course). It looks like the comments are there to increase the site's "link weight" on the search engines, as opposed to get you to click on it. Unfortunately for the spammer, I will not be made into his bitch.
So what do you think? Should I turn off anonymous commenting? Or turn on Captcha (the thing where you have to enter the letters from a picture - although I'm not sure how secure that is anyway)? Or both?