Or like this:

  <item>
    <title>Ask PG: Link to comments in RSS</title>
    <link>http://news.ycombinator.com/item?id=112684</link>  
    <description><![CDATA[<a href="http://news.ycombinator.com/item?id=112684">Comments</a>]]></description>
  </item>

Ok, does it work now? Here's what I'm doing:

  (def rss-stories (stories)
    (tag (rss version "2.0")
      (tag channel
        (tag title (pr this-site*))
        (tag link (pr site-url*))
        (tag description (pr site-desc*))
        (each s stories
          (tag item
            (let comurl (+ site-url* (item-url s))
              (tag title    (pr (eschtml (s 'title))))
              (tag link     (pr (if (blank (s 'url))
                                    comurl
                                    (eschtml (s 'url)))))
              (tag comments (pr comurl))
              (tag description
                (pr "<![CDATA[")
                (link "Comments" comurl)
                (pr "]]>"))))))))

Bloglines now shows the link twice, one from <comments> and one from <description>.

Argh. Can anyone tell me a format that will work on all readers? Is the answer to ditch the comments field?

I also see them twice, but it doesn't bother me. Just leave it as it is.

On 20/2 at around 8:15 pm GMT, the comments link disappeared again for me (in Vienna). What's going on?

Yep - another confirm - comment linked working in google reader now - thanks!

Thanks PG - confirm everything appears to be completely working now!

It's working in akregator now (wasn't working before).

It works in Google Reader!

Thanks!