My blog is rather protected in terms of comment and referral spam. See for example:
But today I had one of those distraught visitors on my blog. Fighting CAPTCHA he succeeded to post approximately 50 comments in 2 hours simply copy-pasting "good" and "ok". It didn't take me that much to delete his comments but bothered me since I get all comments mailed to my inbox. Because of this I hope Chinese Communists will take him one day (IP address: 18.104.22.168).
Speaking of comment spam I don't use "nofollow" attribute since I don't like it (not to mention it is not effective and only escalates spammy attempts). Also I don't close comments for older posts.
Monday, November 20, 2006 10:46 PM