notify me, baby!
Ugh. I've just spent about two hours or so fiddling with some more junk. I can't believe it took that long. Anyway, if you look at the NOTIFY ME section on the right, you'll see that you can now remove yourself from the list.
It's not fancy by any means. It sends a confirmation email, but doesn't require you to confirm anything.
I realise now that this is sort of a step back from the way I had it. When subscribing, a confirmation was needed. Now nothing. Rampant, unchecked subscribing may now ensue. Dear me.
Ack. Now I'm pissed off that I spent all that time.