http://trevorcrookblog.com/2008/07/09/4-simple-rules-to-writing-a-post-script/

From the page: “You may already know the important of having a persuasive headline or title for your blog article etc. . . . however I am guessing you have never given too much thought to how critical including a P.S. (Post Script) is to your sales or written messages.

Your P.S. is the second most read element of your written copy, after your headline, subject line or the title of your blog article.”