This probably isn't a hint so much as a, "Hey, I just figured something out": In Apple Mail's built-in RSS reader, you can view the author of a story in an RSS feed: Right-click on the bar with column-headers on it (Subject, Date, etc) and select "Author." Adjust the columns to fit your preferences.
As far as I can tell, this is the only time you can select that Author headling; if you're in a regular mailbox, it is grayed out.
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20090707172709792