Comment spam is raging here on FSP these days.
There are from 1-5 legitimate comments a day, but now
over 500 total comments.
Up to now, I just reviewed the 'last five comments' on
Moveable Type's administrator interface, and any comment
with a suspicion-raising author name I look at and
depending on the comment's actual content, I likely delete it.
But moderating 600 comments a day is out of the question.
Time to look for a new strategy before turning comments off.
Here's a typical view of the administrator view today:

See also Invasion of the Spambots, by Sam Williams [Salon].