I interpret the phrase "the discourse on photography" to refer to writing about photography whilst the "deepening" would refer to more theoretically informed and better writing on photography on a variety of issues --eg., the objective appearance of things in the photograph and photography's capacity to express something beyond the surface appearance of things. Or the way that the discipline of Art History frames photography in the context of the commodification of visual culture and the rise of modernism and its utopian longing in the art institution with an evaluation system based on masterpieces and masters, originality and innovation, and so on. Or the ways that artists challenge photographic conventions.
At another level it could be a grater linking to other weblogs written by photographers so as to create more of a sense of an ongoing conversation between, and by, photographers and those writing about photography as in the year long project entitled Words Without Pictures by the Los Angeles County Museum of Art.
An exception is Flash a new quarterly journal of reviews, interviews and comment on photography and video, published by the Centre for Contemporary Photography, Melbourne. The first issue is out.
However, altofotnet.org is international and so there is a need to look at what is what haappening in these areas in Europe and America.