I’ve been a bit overwhelmed dealing with comment and traceback/pingback spam on my two blogs, sometimes having to delete up to 50 a day (mostly in the moderation queue, fortunately). My first impulse was to ban comments completely, since most people who leave comments already have their own blogs, and can carry on discussions that way.
However, I do think that comments and pingbacks are valuable, so I’ve come up with a compromise: I will allow comments for all postings in the current and previous month, but close older postings to comments. I’ll still have to deal with a bit of spam, and you won’t be able to comment on very old postings, I think that this approach will work for everyone.
How do people on commercial services, like Blogger, deal with comment spam? Do you spend a measurable amount of time every day deleting it?