penders - 7:57 am on Jul 23, 2010 (gmt 0)
...the check box "Email notification of new replies" next to the Quick Reply text box.
@Dijkgraaf, tangor - have you always seen this; it's never gone away?!
Well, as if by magic, I see it too now - so it looks like it's been put back! Wow, I speak for the people, I am the voice that is listened too!? Or may be it was just magic!? :)