The Technorati Plugin Beta provides a similar list to regular comments - except the links and text excerpts come from the Technorati link cosmos for an article. I'm currently wondering whether something like this couldn't also be done meaningfully with blogger.de - this way you could also catch those who aren't automatically linked via Trackback or Pingback. Of course, you'd have to check for duplicates against the regular trackbacks and pingbacks. Hmm.