Some interesting questions about photography are raised by Christopher Bedford at Words without Pictures in an article entitled Qualifying Photography as Art, or, Is Photography All It Can Be? Bedford says:

the status of photography as art is rarely drawn into question, and the market currency of the medium is beyond dispute. But does it necessarily follow that the fundamental ontology of photography as a practice has been fully interrogated, understood, and integrated into the discourse of contemporary art, assuming its rightful place alongside traditional media like painting, sculpture, and drawing, as well as new media such as installation and video? In other words, does photography exist as photography in art history and criticism today? And if not, why not? Is photography—and by derivation photography criticism—all it can be?