there is both an RSS feed and e-mail notification of replies. as well as a webpage that lets you see the comments since the last time that you checked.
some of these features may only be available to subscribers (I've been a subscriber since before these features were added, so I've never bothered figuring out what's available to non-subscribers)
Posted Aug 28, 2009 20:51 UTC (Fri) by Skud (guest, #59840)
[Link]
I was unable to find them. So either they're not available to non-subscribers, or nigh-impossible to find. They're not in any of the obvious places I would expect (i.e. the link rel=alternate on the thread page, or any UI element in or near the comment form.)