I was looking through some of the spam comments on my blog, and I got really curious about whether certain posts were submitted by a robot or directly. They were obviously promotional in nature, but in some cases that isn't a problem... assuming it is from a real person who visited the blog rather than a robot, and it is posted in the appropriate place (like in a post where I actually ask for links to resources). It would be nice to be able to tell the difference between robot comments and user comments.
I would like to see the User Agent of the commenters in addition to the IP address information already provided.
Although I know that it can be spoofed, not everyone would spoof it, so at least some would show as obvious robots.