Wordplay: This is the best screenwriting advice site on the net.
Script Secrets: One of the best screenwriting tip sites on the net, with tips from a working screenwriter
Writers Guild America (West) Interviews, tips, research links, agency list. Too much to mention.
Muse Of Fire This site has lots of info and tips for beginners and intermediate writers.
Scriptwriting Secrets Excellent site that explains the screenplay format, and how to write to that format with clarity.
Essays on the Craft of Dramatic Writing Some interesting and helpful stuff to read here.
Mark's Screenwriting Page A variety of information and links
Screaming in the Celluloid Jungle Lots of stuff here to consider.
The Nine Act Structure The title speaks for itself. A good alternative to the traditional three-act structure.
Screenwriters and Playwrights Home Page A wealth of information from this well-respected site.
The Megahit Movies While this site promotes a book by the same name, it still contains enough notes and samples to warrant a visit.
Internet Screenwriters Network Lots to see and read here. Includes the Hollydex, a list of agents, producers, etc, to contact.
Film Genres Learn about the different genres, with examples of each.
Screenwriting - a Guide by Mining Co Lots of info here. I found the page on low budget movies helpful.
Dramatica Besides promoting the dramatica software, it has a huge, online book about the dramatica writing process, as well as 200+ links to writer's sites.
Screenwriter's Utopia Links, info, interviews, chat rooms and even free home pages.
Create Your Screenplay A relatively new site, but contains lots of good material.
Literary Scams While not solely focused on screenplays, this site has lots of info on things to avoid when trying to sell your written masterpieces. Be aware, but don't get paranoid.
P and E Literary Agents This site provides lists of agencies that are not recommended to approach. Unfortunately they don't say why they should be avoided. If nothing else, it makes you careful in who you show your work to.
Writers Write Helpful stuff here.
Cinemarquee A site with big ambitions, carrying links not just for screenwriters but film makers in general.
Pro Screenwriter A good site with lots of links, advice, articles and FAQ.
Horror Screenwriter's Page Just what it says, along with much more in the form of links.
Screenwriter's Resource CenterGood for links and info.
Screenwriters OnlineA helpful and informative site.
Resources for Screewriters and PlaywrightsAll kinds of good writing links here.
Sitcom Writer's Jump PointA good place to start when trying to write the funny stuff.
Develop Your IdeaDoes your idea for a script seem worth pursuing? Find some guidelines to check it out here.
Dave Barton's Adventures in WritingSome helpful links.
Writer's WebsiteA smorgesbord of very good writing links here.
Internet Filmakers SiteFor all kinds of filmmaking info. Their FAQ is a good read.
Writer's CutWhile this site promotes a consultant, it does contain helpful pages on script analysis.
Film Budgets Contains a program for computing the budget for your film, but you must know the cost of equipment, etc.
MoviePartners While some parts are still under construction, this site promises lots of good links.
Five Minute Film School It takes more than five minutes to read, but offers an interesting view on producing and procuring work for a film.
Cyber Film School While primarily a pay site, it does have some free info that I like. 100 steps to film producing, screenwriting career stratergy and contact details of agents and star's representatives.
From Script to Screen Read how the vision in the script changes to become the image on the screen. Plus movie reviews.
The Movies Cliche List What not to put in your script, unless you can improve on these.
Screenwriter's Help Information and services for screenwriters.
Internet Crimewriting Network It would be a crime to pass up on the info offered here.
From Fade In Through Fade Out Another helpful site.
The Hollywood Reporter Industry info.
Facsinating Trivia When you want to avoid writing, check out some of the facts on this site. You might find one to get you inspired to write again.
Merriam Webster Online A dictionary to help find the right word, or fun with word games, etc.
Strunk's Elements of Style How to improve your writing.
Online English Grammar Use it to improve it.