A monthly tabloid-sized magazine which calls itself Your Photo and Digital Imaging Resource.
shutterbug contains very few articles (though they tend to be good). It, however, contains many, many ads. If you are looking for anything related to photography and someone somewhere sells it, chances are you will find it in shutterbug.
Camera manufacturers print large ads informing you about their latest models, big mail order camera stores print their entire catalogs in shutterbug. Places that repair cameras advertise there, various photo labs, etc, etc, etc.
All in all, a great magazine to get if you are looking for just about anything photographic and cannot find it locally (including used classical cameras).