Various tools for writers operated by the ReAnimus Press crew:

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

General:

Specific to Smashwords:

More Issues at Hand, by James Blish (as William Atheling, Jr.)
In Search of Wonder, by Damon Knight
Having Relationships With Characters on the Road to Great Fiction, by Andrew BurtThe Issue at Hand, by James Blish (as William Atheling, Jr.)Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.Staying Alive - A WriterAnthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterSpace Travel - A Science Fiction WriterScapescope, by John E. StithOutside Agency (A Kieran Lenahan Mystery), by Conor DalyThe Exiles Trilogy, by Ben Bova13 After Midnight, by Jaime Martinez TolentinoSecrets of the Sands, by Leona WisokerUnderhanded Bridge, by Jerry Sohl