I just added a little Subscription Options widget over there on the right, just above the Categories list. No idea if this will work, or not. Currently there are two options: subscribe via RSS or via email. The former was already available — see the little orange-and-white icon at the top of the sidebar menu, to the left of Hats Recently Chased? As for the latter, well, we’ll see. (I’m testing it myself with this post.)
For the record, not that you’re cynical or anything, I’m not taking it for granted that a lot of people actually want one or the other option. But I had a query about it just the other day (“How do I get notified when there’s a new post?”), and promised to look into it. If you do want either option, well, there it is.
(Supposedly, the email which will tell subscribers that a new post is available will be sent out between 3:00 and 5:00 PM (Eastern time) on the day the post appears. Again, we’ll see!)
Update 2011-11-19:
Email subscription process seems to work just fine. If you use it, let me know if you encounter any problems or have suggestions. (For what it’s worth, I changed the time of the notification email to go out between 1:00 and 3:00 PM.)