Organizations

Writer's Guild of America
Writer's Guild of Canada
Organization of Black Screenwriters
tHe sCriPt dOctOr (msn group)

Scripts Online

Drew's Script O Ramma
All Movie Scripts

Writing

Writing Treatments
scriptsecrets.net

Screenwriter Supplies

Stationary / Brads

Writing Software

Movie Magic
Final Draft

General Research Tools

Almanac
The Research Dept
Word Spy
Thesaurus
Encyclopedia
Baby Names
How Stuff Works

Film Research

imdb
Movie Review Query Engine 200,000+ reviews
Rotten Tomatoes
All Movie Guide
Movie Web
Movie People Search
Cross Cultural Film Guide
ScreenSite List of web-based film and TV resources
Flicker - Links to info on alternative films

Box Office

Box Office Mojo
filmforce
Box Office Guru