Guilds and Copyright Organizations:

Writers Guild of America, west (www.wga.org/)

Writers' Guild of Great Britain (www.writersguild.org.uk)

Society of Authors, Great Britain (www.writers.org.uk/society/)

United States Library of Congress (www.loc.gov/copyright)

Some good books on screenwriting, Hollywood  and the 'Industry':

Making a Good Script Great - Linda Seger

Screenplay: The Foundations of Screenwriting - Syd Field

Screenwriting 434 - Lew Hunter

Adventures in the Screen Trade - William Goldman ( One of the best books on Hollywood written by one of its most talented writers.  Goldman wrote Marathon Man, Butch Cassidy and the Sundance Kid)

Story: Substance, Structure, Style, and the Principles of Screenwriting - Robert McKee

The Art of Dramatic Writing -- Lajos Egri (Chapter 2 has a series of questions that if answered as thoroughly as possible will give you living, breathing well-rounded characters)

More Quotes of the Day:

'Hollywood eats its young.' -- Unknown

'All first drafts are shit.' -- Ernest Hemingway

 'Enclosed, please find a rejection slip for the story you just sent us.  Enclosed, also find another rejection slip for any stories you may write in the future...' -- Peanuts Cartoon, referring to Snoopy