His long-running online newsletter on photography and related matters — widely read by teachers, students, and others in the field — features new texts of Coleman's essays and lectures in each issue. Excerpts from his numerous books, reviews of those works, and publication information on those titles and the books by others to which he has contributed, appear here as well.

C: the Speed of Light also contains information about Coleman's seminars and workshops, notes on his recent and upcoming projects and activities, and other material useful to anyone with a serious interest in photography, contemporary art, and new digital technologies.