Via Spring [1], I see that National Novel Writing Month [2] has a new sibling: Script Frenzy [3], writing a screenplay in a month.
Now, traditionally, a screenplay is measured in pages, with each page approximately translating to a minute of screen time, but in this, they're counting words—20,000 to be exact. However, they scanned a bunch of screenplays and found the average length was 20,000 words [4], so that's the target.
Sounds intriguing.
I guess it's time to check out The Nine Act Film Structure [5] among other screenplay structures [6], and dust off the ol' Quick and Dirty B-Movie Plot Generator [7] (which gives more plots than the one found on the Script Frenzy home page).
[1] http://springdew.livejournal.com/776247.html
[3] http://www.scriptfrenzy.org/
[4] http://www.scriptfrenzy.org/eng/node/120303
[5] http://hs34.order-vault.net/~admin160/film/nine_act.html
[6] http://www.geocities.com/rfg170/sw/StoryParadigms.txt