Spam hasn't been a huge problem on the CST blogs - for one thing, we have obscurity (my own server) on our side, and, for another, the various blocking schemes I've put in place seem to work pretty well. Even so, it's useful to be able to delete multiple comments at once - so that's a feature of the web admin stuff now. If you login, and go to the post editing page, you can select a post, see all the comments, and select which ones (if any) to delete.