I've been contacted by Mike Ashley, a historian and anthologist in the U.K. He is
working on the final volume of a history of the science fiction magazine for Liverpool University Press. This volume covers the years 1981 to the present, so there'll be a fair coverage of online magazines.
He wants my input as an author who broke in via ezines, as well as information about Sentinel S-F, the ezine that I published five times in 2007.