I just this moment became aware of another great organization for aspiring writers and editors (even though it has been around almost as long as I have). The Association of Writers and Writing Programs has a wealth of information for you. You can access many career-advice articles for free at http://www.awpwriter.org/careers/articles.htm. For more information and access to the AWP JobList, you can become a member for $65 per year ($37 if you're a student).
The Association of Writers and Writing programs is sponsored by George Mason University in Fairfax, Virginia. Check it out!