Comments Subscribing via RSS
At a suggestion from Dave Winer, instead of adding email subscriptions for comments pages, I added RSS subscriptions.
On every comments page (on this site and on ranchero.com), near the bottom of each page, there’s a link to an RSS feed for just that page. That way you can keep up with any conversations you may be interested in.
I might also add email subscriptions, too—but I think RSS solves the problem very nicely.