We all know who they are.  They ask a poorly worded, off-topic question, get downvoted into oblivion (which is 1, since they are a new user), and otherwise get sliced and diced with comments.  

But they are not hearing you, because they have long since left, probably because they are not used to instantaneous answers from a forum, like you can get on Stack Overflow.

Consider placing a notification popup when the user posts *his first question only*, something to the effect of (with potentially better wording):

> Thank you for posting a question on Stack Overflow.  Questions often get answered quickly here. 
> Since this is your first posted
> question, please consider sticking
> around for a few minutes to see if
> others have posted comments, or otherwise have concerns about your question.