Various tools for writers operated by the ReAnimus Press crew:

Heinlein in Dimension, by Alexei Panshin
Having Relationships With Characters on the Road to Great Fiction, by Andrew Burt

General:

More Issues at Hand, by James Blish (as William Atheling, Jr.)
How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush
Modern Science Fiction, by Reginald Bretnor, ed.Footprints on Sand, by L. Sprague de Camp and Catherine Crook de CampSF in Dimension, by Alexei and Cory PanshinGalaxy Magazine: The Dark and the Light Years, by David L. RosheimIn Search of Wonder, by Damon KnightThe Craft of Writing Science Fiction that Sells, by Ben BovaAnthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterStaying Alive - A WriterThe Issue at Hand, by James Blish (as William Atheling, Jr.)HeinleinThe Science Fiction Novel, by Basil Davenport, Robert A. Heinlein, C. M. Kornbluth, Alfred Bester, and Robert BlochSpace Travel - A Science Fiction Writer