Websites that feature articles by many writers often append some brief information about the author at the end of each article (or alternatively, this information appears when you click on the author's name). This often includes links to the authors' books, blogs, professional websites, etc., and is understood as merely giving information about the author, not as an endorsement of the stuff behind the links.

I'm not sure if it would be a good idea to make this a built-in feature of LW, but I don't see any reasons why people writing top-level (or even discussion) articles shouldn't append a short paragraph of this sort to their articles. The only potential problem I see is that some people might start writing worthless articles for the purposes of self-promotion, but the voting system should take care of that.