Blogger comment moderation (approval)

Blogger now offers comment moderation, which is basically the ability to accept or reject comments before they get published to your blog.

perhaps you just want to catch any comment spam before it reaches your page. Whatever your reasons, the comment moderation feature will let you view all comments before they appear on your blog, giving you a chance to approve or reject them as desired.

You have to turn it on in Settings - Comments.  A basic feature, but another brief advance in the war against spam.