Rodent Regatta

Radio Userland Lists?
I’m puzzled about the different lists that we can get with Radio. Referers, Ranking by PageReads, weblogs.com, and now Updates. Sometimes they are listed by the domain name that is pointing to your site. Other lists (Updates & weblogs.com) show the name of the weblog. Jenny Levine makes the list of Ranking by PageReads, but The Shifted Librarian makes the list at weblogs.com.
What’s the underlying logic doing that causes this difference?