Top 10 Best Screenwriting Sites

[Albertioti]

http://www.finaldraft.com/
http://www.oscars.org/awards/nicholl/index.html
http://www.script-o-rama.com/
http://www.clickok.co.uk/index4.html
http://www.plotbot.com
http://www.variety.com
http://www.wga.org
http://www.rickygervais.com/thissideofthetruth.php
http://www.writersdigest.com/GeneralMenu/
http://www.inktip.com/

(also just useful for inspiration)

 

[cereal killer]

Screen Actors Guild

which I'm a proud member of : )

 

[aceofspades]

I use Celtx to write my material. I'm SAG elig. cereal killer, but I don't join because there's more non than union work here.