Ever watch a movie and think you could write a better one? Here’s your chance, without having to invest in pricey screenwriting software. Plotbot is a nifty web-based interface that walks you through the mechanics of screenwriting, handles all of the tricky formatting issues, and even allows you to collaborate privately or publicly. There are a lot of other great resources for writers online, including this discussion from Kurt Vonnegut about why we need drama (with charts!), Screenwriting Tips, and Scriptologist.
Give it a try, and if your film gets made, remember to thank me in your Oscar acceptance speech!