As a follow-up to bp's entry on RSS Comments, I now give you a bookmarklet for bloglines and My Yahoo! users that will let you subscribe to RSS comments:

Subscribe to Comments (Bloglines)

Subscribe to Comments (My Yahoo!) (NOTE: you must add the RSS Headlines content to your My Yahoo! page)

Of course, bp's site is the only site supporting RSS comments right now, but I plan to add that feature to every movabletypo site, as well as kwc.org (when the real server comes back online).

Update: added My Yahoo! bookmarklet.