Various tools for writers operated by the ReAnimus Press crew:

More Issues at Hand, by James Blish (as William Atheling, Jr.)
Having Relationships With Characters on the Road to Great Fiction, by Andrew Burt

General:

Specific to Smashwords:

How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush
The Craft of Writing Science Fiction that Sells, by Ben Bova
Galaxy Magazine: The Dark and the Light Years, by David L. RosheimStaying Alive - A WriterOf Worlds Beyond, by Lloyd Arthur Eshbach, ed.Footprints on Sand, by L. Sprague de Camp and Catherine Crook de CampHeinlein in Dimension, by Alexei PanshinHeinleinThe Issue at Hand, by James Blish (as William Atheling, Jr.)Space Travel - A Science Fiction WriterThe Science Fiction Novel, by Basil Davenport, Robert A. Heinlein, C. M. Kornbluth, Alfred Bester, and Robert BlochSF in Dimension, by Alexei and Cory PanshinAnthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterModern Science Fiction, by Reginald Bretnor, ed.