Mike, i think people put stuff like "worked at burger king" etc etc to show transferable skills. And I would say that an employer is more likely to employ you if you have been emplyed before as it shows maturity and responsability. For example I am starting to apply to companies now for graphics based jobs but I am still putting down the fact that I worked in tech support etc for a couple of years just to show them that I have been employed and I have other skills outside of graphics. I agree that you dont need to put every job you've done but I would put something rather than "Not Applicable".

Just my tuppence worth
Alan