If you use Community Builder (CB) and the CBAuthorBot (the one that makes the author's name linkable to their CB Profile), then you might be interested in this hack. It enables you to display the author's CB avatar at the top of an article with a link back to his or her CB profile. I originally posted it here on the CB website. You can go there for more information, and to see how other people have modified the hack.
Here's the code: