There are so many magazines that have done interesting things in being devoted to reprints from other sources...these three are among those most important to my reading experience, and at least two of them are among those magazines which help blur the lines, for some at least, between books and magazines.
Ellery Queen's Anthology was the big, sloppy reprint cousin of the rather sloppily-produced Ellery Queen's Mystery Magazine of the first decade and change of Davis Publications' ownership of the latter magazine (the earlier issues, from Mercury Press, were rather more elegantly produced, and when Joel Davis took over Davis from his father, founder and Ziff-Davis refugee B.G. Davis, EQMM and EQA started to look rather less slapdash again). These productions, which were also published in hardcover by Dial Press and others, were both great ways for Frederic Dannay and company to reprint novellas and short novels that had fallen into obscurity, but also to reprint shorter stories from EQMM, which itself continued to offer classics and obscurities as it pleased Dannay (but far less frequently than in the early years at Mercury). When Davis Pubs. acquired Alfred Hitchcock's Mystery Magazine and Analog, and founded Isaac Asimov's Science Fiction Magazine, they too soon had fat "Anthology" reprint companions on the newsstands in the EQA model (though as time went on, the magazine versions started to take on rather more indivuated titles for each issue, and some were mixes of reprints from the two CF and two SF magazines, rather like the books they were producing simultaneously).
The Magazine of Horror was a small-circulation but doughty magazine that ran for most of the '60s and into the earliest '70s, as the primary market to carry the "horror" banner, even while F&SF and Fantastic for most of those years were also fine sources for the fiction, but didn't advertise as obviously (Joseph Payne Brennan's little magazine Macabre also made its way through the decade, but not on newsstands). Put together on almost no budget by editor Robert Lowndes, who had taken on a job at the small publisher Health Knowledge after the collapse of the Columbia magazine line in 1960 (where Lowndes had been editing some of the last pulp magazines, on a slightly larger microbudget, and introducing such writers as Edward Hoch and Carol Emshwiller to the reading public), MOH was the first and ultimately the last of the fiction magazines published by them at his suggestion (among the other titles he also edited for HK included Famous Science Fiction and Worldwide Adventure; MOH's very similar stablemate Startling Mystery Stories was the first to publish F. Paul Wilson and Stephen King, in its tendency to offer new fiction by young writers along with the reprints from famous and obscure older contributors). Hoch published some of his Simon Ark stories with MOH, Ramsey Campbell offered some of his first non-Lovecraftian work there, Joanna Russ and Roger Zelazny placed such notable stories as "Come Closer" and "Divine Madness" (respectively) with the magazine, and I'm sure not too many periodicals have offered the reading public stories by Robert Bloch, John Steinbeck, and Seabury Quinn simultaneously.
For more of Friday's Books, please see Patti Abbott's blog for the rundown of contributors.