My suggestion, if a post is reported then could the report to moderator option be removed from the reported post? This way multiple users are not reporting the same posts as well as moderators do not have to look at the same report over and over. Seems like it would be a better system.
Okay no, it would work in an ideal reality, unfortunately this ain't it. Along with what o_e_l_e_o and iasenko highlighted, I think what might possibly help is some sort of an indicator perhaps? Say if someone has got 5 posts deleted by the mods in the past 1 week, so his account has a small caution tag which advises the user to post carefully. This indicator could be either shown to all logged in users, or say frequent reporters(like those who have 300+ reported posts).
Also, the reporting procedure should provide some sort of possible options in the reporting menu. Let's say a post has a url tag in it, then the report page automatically shows a button which displays as "Link contains malware" and the user can click it and the report will be sent. Or if the post contains a pic, the report menu will have an auto-generated button for reporting NSFW images, or if a post contains more than 2 paragraphs, a button for plagiarism perhaps. All these could be like extra suggestions to help out the user, the main reporting text area will still be the same. I know this has been suggested before, but it doesn't hurt to suggest again.