Various tools for writers operated by the ReAnimus Press crew:

Modern Science Fiction, by Reginald Bretnor, ed.
The Science Fiction Novel, by Basil Davenport, Robert A. Heinlein, C. M. Kornbluth, Alfred Bester, and Robert Bloch

General:

How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush
Galaxy Magazine: The Dark and the Light Years, by David L. Rosheim
Heinlein in Dimension, by Alexei PanshinOf Worlds Beyond, by Lloyd Arthur Eshbach, ed.Footprints on Sand, by L. Sprague de Camp and Catherine Crook de CampIn Search of Wonder, by Damon KnightStaying Alive - A WriterSF in Dimension, by Alexei and Cory PanshinMore Issues at Hand, by James Blish (as William Atheling, Jr.)Having Relationships With Characters on the Road to Great Fiction, by Andrew BurtThe Issue at Hand, by James Blish (as William Atheling, Jr.)HeinleinAnthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterThe Craft of Writing Science Fiction that Sells, by Ben Bova