Various tools for writers operated by the ReAnimus Press crew:

Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.
How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush

General:

Specific to Smashwords:

Having Relationships With Characters on the Road to Great Fiction, by Andrew Burt
In Search of Wonder, by Damon Knight
More Issues at Hand, by James Blish (as William Atheling, Jr.)Space Travel - A Science Fiction WriterAnthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterStaying Alive - A WriterThe Issue at Hand, by James Blish (as William Atheling, Jr.)The Craft of Writing Science Fiction that Sells, by Ben BovaExperiment Perilous: The KafkaEinar and the Cursed City, by Chet GottfriedWalls and Wonders, by S. R. AlgernonFitzRoy, by John and Mary GribbinThe Kinsman Saga, by Ben Bova