This user http://stackoverflow.com/users/164299/rachel continually posts questions. Just to absorb the contents of the questions she has already asked would take a year or more I think. And yet the questions keep popping up: http://stackoverflow.com/questions/1653405/books-on-portal-developments. I don't think she is actually reading the answers but just asking lots of questions for getting the reputation points.
Does anything need to be done about such a person, and if so, what?
Postscript: In response to some people who replied to this question, I'd like to point out that a lot of Rachel's questions are not only downvoted but also deleted/closed/disappearing. There are fifteen pages of questions, and only six pages of these have even one upvote. There are three pages of downvoted questions, and I don't know how many pages of deleted questions.