META: Follow comments

I've just added a Plug-In to the blog that allows you to subscribe to a comment thread via e-mail. That way if you comment on a story you can check a box, enter your e-mail address, and you'll get a message any time anyone posts a follow-up comment to that thread. It's one of those pre-packaged deals, so it looks a little generic, but it ought to work. Holler if you have any problems with it.