Radio wish: comment-to-email

Here’s a feature request for Radio. I’d like to have an option to turn on email notification triggered by comments. Any time someone posts a comment to RFB, for example, I’d like to get an email message containing the comment or at least containing a link back to it. I’ve got Second p0st’s comment-to-RSS thing going, so I generally do see comments in my aggregator, but that one notch of additional convenience would be cooool.
LiveJournal and Movable Type have this feature out of the box. (So does Manila but that’s a CMS at a different price point, not just a blog tool.)