Various tools for writers operated by the ReAnimus Press crew:

Of Worlds Beyond, by Lloyd Arthur Eshbach, ed.
The Craft of Writing Science Fiction that Sells, by Ben Bova

General:

Specific to Smashwords:

The Issue at Hand, by James Blish (as William Atheling, Jr.)
How To Improve Your Speculative Fiction Openings, by Robert Qualkinbush
More Issues at Hand, by James Blish (as William Atheling, Jr.)Staying Alive - A WriterIn Search of Wonder, by Damon KnightAnthopology 101: Reflections, Inspections and Dissections of SF Anthologies, by Bud WebsterSpace Travel - A Science Fiction WriterHaving Relationships With Characters on the Road to Great Fiction, by Andrew BurtCinnabar, by Edward BryantXPERTS: Mindwave, by Jenny Shearer with Hermann MaurerCommencement, by Roby James1066, by Robert SilverbergBut Wait.... ThereThe Box: An Oral History of Television, 1920-1961, by Jeff Kisseloff