Various tools for writers operated by the ReAnimus Press crew:

Galaxy Magazine: The Dark and the Light Years, by David L. Rosheim
The Issue at Hand, by James Blish (as William Atheling, Jr.)

General:

Specific to Smashwords:

Heinlein in Dimension, by Alexei Panshin
Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.
Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterHow To Improve Your Speculative Fiction Openings, by Robert QualkinbushHaving Relationships With Characters on the Road to Great Fiction, by Andrew BurtIn Search of Wonder, by Damon KnightHeinleinStaying Alive - A WriterSpace Travel - A Science Fiction WriterThe Science Fiction Novel, by Basil Davenport, Robert A. Heinlein, C. M. Kornbluth, Alfred Bester, and Robert BlochMore Issues at Hand, by James Blish (as William Atheling, Jr.)Footprints on Sand, by L. Sprague de Camp and Catherine Crook de CampModern Science Fiction, by Reginald Bretnor, ed.SF in Dimension, by Alexei and Cory Panshin