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Erin, usually there is something in particular that drives a nomination. For example, Liese was the MoM this month because she created the "Lester, Our Own Mark Twain" thread to commemorate a previous MoM who had a severe stroke.
Members send in names of others who they feel did something commendable, or who they just think are an asset to the site. Some so far have been tour guides, games moderators, or people who are just darned nice.
So hop on into the forums and be a good member. Maybe one day you'll find yourself the MoM!
Hope this helps!