I've published my CV on Careers, even though I'm not actively looking for a job, because of a family situation in which I would be open to jobs under particular circumstances. My situation is actually a good thing, but not something that everyone needs to know. I'd like to be able to communicate this to potential employers, but don't really want this information to appear in my published CV. I had originally included it in my personal statement, but that gets published publicly.
What I'd like to see is a section available to communicate information only to employers. This section should would contain free form information about the job search process or any special requirements that one might have.