Various tools for writers operated by the ReAnimus Press crew:

How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush
The Craft of Writing Science Fiction that Sells, by Ben Bova

General:

Specific to Smashwords:

Space Travel - A Science Fiction Writer
Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.
Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterStaying Alive - A WriterIn Search of Wonder, by Damon KnightMore Issues at Hand, by James Blish (as William Atheling, Jr.)The Issue at Hand, by James Blish (as William Atheling, Jr.)Having Relationships With Characters on the Road to Great Fiction, by Andrew BurtThe Lemon Eaters, by Jerry SohlAmong the Dead and Other Events Leading to the Apocalypse, by Edward BryantTwice Seven, by Ben BovaThe Exiles Trilogy, by Ben BovaFetish, by Edward Bryant13 After Midnight, by Jaime Martinez Tolentino