Various tools for writers operated by the ReAnimus Press crew:

In Search of Wonder, by Damon Knight
The Issue at Hand, by James Blish (as William Atheling, Jr.)

General:

Specific to Smashwords:

How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush
Staying Alive - A Writer
Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterThe Craft of Writing Science Fiction that Sells, by Ben BovaOf Worlds Beyond, by Lloyd Arthur Eshbach, ed.Having Relationships With Characters on the Road to Great Fiction, by Andrew BurtSpace Travel - A Science Fiction WriterMore Issues at Hand, by James Blish (as William Atheling, Jr.)The Winds of Altair, by Ben BovaServants of the Sands, by Leona WisokerExperiment Perilous: The KafkaThe Juror, by Harvey JacobsTrilobyte, by Edward Bryant