Various tools for writers operated by the ReAnimus Press crew:

Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud Webster
The Craft of Writing Science Fiction that Sells, by Ben Bova

General:

Specific to Smashwords:

Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.
More Issues at Hand, by James Blish (as William Atheling, Jr.)
How To Improve Your Speculative Fiction Openings, by Robert QualkinbushFootprints on Sand, by L. Sprague de Camp and Catherine Crook de CampSF in Dimension, by Alexei and Cory PanshinThe Science Fiction Novel, by Basil Davenport, Robert A. Heinlein, C. M. Kornbluth, Alfred Bester, and Robert BlochHaving Relationships With Characters on the Road to Great Fiction, by Andrew BurtStaying Alive - A WriterGalaxy Magazine: The Dark and the Light Years, by David L. RosheimHeinlein in Dimension, by Alexei PanshinIn Search of Wonder, by Damon KnightThe Issue at Hand, by James Blish (as William Atheling, Jr.)Space Travel - A Science Fiction WriterHeinlein