'I wrote all the time. Everywhere. When I wasn't writing, I was thinking about it or continuing to 'write' in my head. -- Sam Shepard
Available Now: Playwriting Seminars 2.0
The revised and expanded e-book edition.
Here's the full Table of Contents and ordering link for the new edition.
There's not an overwhelming interest among Regional Theatres for One-acts. Even Related One-Acts masquerading as a full-length play rarely make it into a rep theatre's season. Think of One-acts as great exercises, though the quirks of the form don't necessarily make these good training for the long-windedness required for writing what's at the heart of this business: The full-length play. Keys for writing One-acts
http://www.vcu.edu/arts/playwriting/