At the second AFM Wordsmiths event, Zeb Eckles gave an excellent presentation on internet resources for screenwriters. Thanks Zeb! That was great. Here is his list:
A decent, yet not comprehensive, guide to screen writing online
Writers:
http://johnaugust.com/
http://www.wordplayer.com/columns/welcome.html
http://sex-in-a-sub.blogspot.com/
http://www.gointothestory.com/
http://screenwritingfromiowa.wordpress.com/
http://thedarksalon.blogspot.com/
http://thelastreveal.blogspot.com/
http://complicationsensue.blogspot.com/
http://swritersleague.blogspot.com/
http://yourscreenplaysucks.wordpress.com/
http://www.blakesnyder.com/
Readers:
http://thebitterscriptreader.blogspot.com/
http://screenwritingtips.tumblr.com/
http://www.justeffing.com/
http://thestorydepartment.com/
http://scriptshadow.blogspot.com/
Resources:
http://www.script-o-rama.com/
http://www.simplyscripts.com/
http://www.mypdfscripts.com/
http://blog.itsonthegrid.com/
http://www.donedealpro.com/
http://www.trackingb.com/
http://www.variety.com/Home/
http://www.hollywoodreporter.com/
http://www.collider.com/
http://www.reelmovienews.com/
http://makingof.com/
http://www.inktip.com/
http://www.gitsclub.proboards.com/index.cgi
http://wga.org/
http://www.bachelorsdegree.org/2010/10/12/60-best-blogs-for-aspiring-screenwriters/