Various tools for writers operated by the ReAnimus Press crew:

Space Travel - A Science Fiction Writer
The Craft of Writing Science Fiction that Sells, by Ben Bova

General:

Specific to Smashwords:

In Search of Wonder, by Damon Knight
Having Relationships With Characters on the Road to Great Fiction, by Andrew Burt
Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterHow To Improve Your Speculative Fiction Openings, by Robert QualkinbushStaying Alive - A WriterMore Issues at Hand, by James Blish (as William Atheling, Jr.)The Issue at Hand, by James Blish (as William Atheling, Jr.)Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.Magic of Wild Places, by Bruce TaylorParticle Theory, by Edward BryantConquerors from the Darkness, by Robert SilverbergRage of Stars: Book Three of The Sigil Trilogy, by Henry GeeThe Star Conquerors (CollectorsScapescope, by John E. Stith