You've still got about a month to take Yves Lavandier and his publisher Clown Enfant up on their generous special offer for his book, "Writing Drama".
If you're still not sure what all the fuss is about, check out Robin Kelly's fantastic in-depth review of "Writing Drama" here.
For any of you jaded "screenwriting books are crap" types, I feel you, I was you. Until I read this book. There are no formulas, no assertions, no irritating smugness - just stellar thoughts on the process of what constitutes real drama and an intelligent discussion of various movies, plays, techniques et al that WILL help your writing and understanding of the craft.
Read my Q&As with Yves Lavandier here and here.