Various tools for writers operated by the ReAnimus Press crew:

Space Travel - A Science Fiction Writer
How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush

General:

Specific to Smashwords:

In Search of Wonder, by Damon Knight
Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.
Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterHaving Relationships With Characters on the Road to Great Fiction, by Andrew BurtStaying Alive - A WriterMore Issues at Hand, by James Blish (as William Atheling, Jr.)The Issue at Hand, by James Blish (as William Atheling, Jr.)The Craft of Writing Science Fiction that Sells, by Ben BovaThe Weathermakers, by Ben BovaXPERTS: The Paranet, by Hermann MaurerTo Save The Sun, by Ben Bova and A. J. AustinThe Planet Masters, by Allen L. WoldThe Transcendent Man, by Jerry SohlTimeshare: A Time for War, by Joshua Dann