Well, the open blog experiment was interesting, but things are starting to get a little out of control. We just got a white power racist spam posted as a comment (it's been deleted, don't bother looking). Don't those people have anything better to do with their time?
So I'm closing things up a little. I've turned on comment moderation. Members' comments get approved automatically. Non-members' comments will be e-mailed to me for approval before they get posted to the blog. I thought this would require some trickiness on my part, but it turned out that's the way Blogger works by default, so it was easy as pie.
I'll try to look through and approve the non-member comments daily, but I make no guarantees. I reserve the right to go on a month-long vacation without notifying anyone, during which time no comments would be allowed at all except for members.