Various tools for writers operated by the ReAnimus Press crew:

Space Travel - A Science Fiction Writer
Galaxy Magazine: The Dark and the Light Years, by David L. Rosheim

General:

The Issue at Hand, by James Blish (as William Atheling, Jr.)
Having Relationships With Characters on the Road to Great Fiction, by Andrew Burt
Heinlein in Dimension, by Alexei PanshinStaying Alive - A WriterSF in Dimension, by Alexei and Cory PanshinIn Search of Wonder, by Damon KnightHow To Improve Your Speculative Fiction Openings, by Robert QualkinbushAnthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterThe Science Fiction Novel, by Basil Davenport, Robert A. Heinlein, C. M. Kornbluth, Alfred Bester, and Robert BlochThe Craft of Writing Science Fiction that Sells, by Ben BovaOf Worlds Beyond, by Lloyd Arthur Eshbach, ed.Footprints on Sand, by L. Sprague de Camp and Catherine Crook de CampModern Science Fiction, by Reginald Bretnor, ed.More Issues at Hand, by James Blish (as William Atheling, Jr.)