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:

Staying Alive - A Writer
The Issue at Hand, by James Blish (as William Atheling, Jr.)
The Craft of Writing Science Fiction that Sells, by Ben BovaAnthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterSpace Travel - A Science Fiction WriterHow To Improve Your Speculative Fiction Openings, by Robert QualkinbushMore Issues at Hand, by James Blish (as William Atheling, Jr.)In Search of Wonder, by Damon KnightStar Watchmen, by Ben BovaCommitment, by Roby JamesSouls and Hallows, by S. R. AlgernonBeyond the Hedge, by Roby JamesCompanion to the Cosmos, by John GribbinShadrach in the Furnace, by Robert Silverberg