Last night, I reenabled Everybody so as to allow my friends who don't have LJ accounts to post comments and the like to the blog. This morning, there's some 34 (!!) spam blog comments again. So I've disabled it again, and set it for comments and the like only from registered users.
So, if you're my friend and you want to comment to one of my blog entries but you don't have an account, you know what you have to do. :) And I'm really sorry that it comes to this.