hcshi - 1:23 am on Oct 17, 2006 (gmt 0) So I don't believe those additional links imply "auhority".
I think having those additional listing has nothing to do with "authority". If you structure and link your site strategically, you'll get those additional links. I have several websites that have those additional listing for some not-so-competitive keywords. It is not difficult to get those additional listings for niche keywords.
So I don't believe those additional links imply "auhority".