This is a subject that has long interested me, as a professional person with, shall we say, some--alternative--interests.
We've all heard about the professional fallout from personal blogs ridiculing bosses, embarassing Facebook pages, etc. But the opposite is true, too--you can promote your career through your online presence. Here's a good blog pages discussing this:
http://webworkerdaily.com/2007/03/28...nline-persona/