Comment moderation in WP 1.0 is a giant step in the direction of reducing comment spam. I had used a manual method of weeding out comment spam (by going through all comments long after they were posted and had made some damage) for some time, but WP 1.0 takes it one step further. With comment moderation turned on, a message is posted above the comments, which tells the readers that moderation is turned on and the comments posted will not show up on the blog until it is approved by the admin of the blog (which is a deterrent to comment spam by itself). Every time a comment is posted on your blog, you get an email notification (which can be turned on or off) to approve the comment that is posted. You can approve or delete comments by bulk or singly. I envision checking my blog once a day (when I post or make changes) to weed through the comments and authorize the ones I think are fit. Most of the internals of this process can be turned on or off and can be modified to satisfaction. It really is a very interesting and versatile feature which can help tremendously in comment spam moderation. It is also a stepping stone for further automation of comment spam reduction using autonomous/learning methods. Check out WordPress 1.0 Platinum for yourself and see what I mean.