Various tools for writers operated by the ReAnimus Press crew:

Having Relationships With Characters on the Road to Great Fiction, by Andrew Burt
Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.

General:

Specific to Smashwords:

The Craft of Writing Science Fiction that Sells, by Ben Bova
Staying Alive - A Writer
Space Travel - A Science Fiction WriterThe Issue at Hand, by James Blish (as William Atheling, Jr.)In Search of Wonder, by Damon KnightHow To Improve Your Speculative Fiction Openings, by Robert QualkinbushMore Issues at Hand, by James Blish (as William Atheling, Jr.)Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterRock Star, by Tim Poston and Ian StewartBut Wait.... ThereKafkaLair of the Cyclops, by Allen L. WoldThe Winds of Altair, by Ben BovaThe Living Labyrinth, by Ian Stewart and Tim Poston