Various tools for writers operated by the ReAnimus Press crew:

How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush
The Craft of Writing Science Fiction that Sells, by Ben Bova

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 WebsterOf Worlds Beyond, by Lloyd Arthur Eshbach, ed.Staying Alive - A WriterThe Issue at Hand, by James Blish (as William Atheling, Jr.)Side Effects, by Harvey JacobsBug Jack Barron, by Norman SpinradThe Gilded Basilisk, by Chet GottfriedA Song of Awakening, by Roby JamesMamelle, by Jerry SohlThe Sigil Trilogy (Omnibus vol.1-3), by Henry Gee