Various tools for writers operated by the ReAnimus Press crew:

The Issue at Hand, by James Blish (as William Atheling, Jr.)
Having Relationships With Characters on the Road to Great Fiction, by Andrew Burt

General:

Specific to Smashwords:

Staying Alive - A Writer
In Search of Wonder, by Damon Knight
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.How To Improve Your Speculative Fiction Openings, by Robert QualkinbushMore Issues at Hand, by James Blish (as William Atheling, Jr.)Space Travel - A Science Fiction WriterThe Joy of Booking, by Bud WebsterMexica, by Norman SpinradBut Wait.... ThereNight Slaves, by Jerry SohlThe Time Dissolver, by Jerry SohlUnderhanded Bridge, by Jerry Sohl