You'll thank me later.

Here's some advice for all you job seekers -- do NOT send your resume to your prospective employer by certified mail -- or registered mail or express mail or anything other than good old first class. What are you hoping to accomplish? Do you really think that people are going to think your resume is impressive because you put extra postage on it?
All you've done is piss off the guy who has to stand in line at the Post Office to pick up your unnecessarily complicated crap. And you don't want to piss off that guy cuz every time I get one like that I take it the Human Resources department and say "Here's another knucklehead who doesn't have a job but is spending four dollars and sixty-four cents to mail something that should have only cost him thirty-nine cents. If he's that foolish with his own money, imagine what he would do if he had any control over the company's assets. Is this the type of person we want working here?"
And the HR people will sigh and reassure me once again that they have never hired anybody who sent in their application via certified mail.
So don't do it.