Various tools for writers operated by the ReAnimus Press crew:

Galaxy Magazine: The Dark and the Light Years, by David L. Rosheim
SF in Dimension, by Alexei and Cory Panshin

General:

Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud Webster
Footprints on Sand, by L. Sprague de Camp and Catherine Crook de Camp
HeinleinHeinlein in Dimension, by Alexei PanshinThe Craft of Writing Science Fiction that Sells, by Ben BovaMore Issues at Hand, by James Blish (as William Atheling, Jr.)Space Travel - A Science Fiction WriterIn Search of Wonder, by Damon KnightHaving Relationships With Characters on the Road to Great Fiction, by Andrew BurtHow To Improve Your Speculative Fiction Openings, by Robert QualkinbushOf Worlds Beyond, by Lloyd Arthur Eshbach, ed.The Issue at Hand, by James Blish (as William Atheling, Jr.)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