I am going to play devil's advocate on this one. For lots of hiring folks, I am sure that putting the score will not do any real harm. They won't know exactly what to make of it and will skip over it.
Then there are the 2nd group like my mom. These might do marginal harm as they could misinterpret your score as "not very good".When I took the GMAT it went something like this:
me: Mom,I just got my gmat score!
mom: gmat?
me: It is like the SAT, but to get into business school.
mom:oh, uh.. ok.
me: I got a 750!
mom: You usually do well on tests, what went wrong?
me: that is 98 percentile! It is out of 800!
mom: Oh, thats nice dear.(unimpressed)
The worst group is the 3rd one. You said you are applying for relatively entry level jobs, so you will be running with a bit of a different crowd than you may be used to. Some people really get offended by someone trying to improve their lot in life. They consider such folks "elitist". I think the recent issue in the media with Obama being called "elitist" proves that (rightly or wrongly I won't make a judgment cause this isn't the place for politics) for some people this really is a big issue. I'm sure we've all met someone who employed "anti-elitist" snobbery at us when we revealed our B-school plans. If you apply for a receptionist job, and they see your gmat score and KNOW WHAT IT MEANS.. they might kind of decide you are an "elite SNOB". I'm sure this is kind of the fringe case, but something to at least consider.
Overall I think that while unlikely, it wouldn't be exactly *shocking* to have a bad reaction to listing your gmat. Personally I would still list it because I don't want to associate with the folks that would be offended, but just something to think about.
cheers