Every once in a while I do some product shots here and there. Either to sell my own stuff or on assignment for others.
I consider product photography barely more than a hobby, but since I do it so often, I acquired some skills over the years that allow me showcase simple, not too big objects in a pleasing way. Stuff like getting a paper-white background, achieving sufficient depth of field, modeling three dimensionality or lighting the object in an interesting way. Skills that help to sell or showcase products or put them on display in books, brochures or on the web.