Various tools for writers operated by the ReAnimus Press crew:

Having Relationships With Characters on the Road to Great Fiction, by Andrew Burt
How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush

General:

Specific to Smashwords:

Anthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud Webster
More Issues at Hand, by James Blish (as William Atheling, Jr.)
In Search of Wonder, by Damon KnightSpace Travel - A Science Fiction WriterOf Worlds Beyond, by Lloyd Arthur Eshbach, ed.Staying Alive - A WriterThe Craft of Writing Science Fiction that Sells, by Ben BovaThe Issue at Hand, by James Blish (as William Atheling, Jr.)Guardians of the Desert, by Leona WisokerThe War Minstrels, by Karen HaberTo Save The Sun, by Ben Bova and A. J. AustinTest of Fire, by Ben BovaServants of the Sands, by Leona WisokerFlies from the Amber, by Wil McCarthy