Various tools for writers operated by the ReAnimus Press crew:

Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.
How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush

General:

Specific to Smashwords:

The Issue at Hand, by James Blish (as William Atheling, Jr.)
Heinlein
Heinlein in Dimension, by Alexei PanshinGalaxy Magazine: The Dark and the Light Years, by David L. RosheimHaving Relationships With Characters on the Road to Great Fiction, by Andrew BurtIn Search of Wonder, by Damon KnightFootprints on Sand, by L. Sprague de Camp and Catherine Crook de CampThe Science Fiction Novel, by Basil Davenport, Robert A. Heinlein, C. M. Kornbluth, Alfred Bester, and Robert BlochSF in Dimension, by Alexei and Cory PanshinThe Craft of Writing Science Fiction that Sells, by Ben BovaMore Issues at Hand, by James Blish (as William Atheling, Jr.)Modern Science Fiction, by Reginald Bretnor, ed.Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterStaying Alive - A Writer