I haven't read any books about writing. I just write because I love it. :) I don't know whether these will help me or not, but I think they'll be interesting - I just ordered:
A Novel Idea by ChiLibris (I found a pretty extensive online preview but I wanted to know what was on the missing pages!)
On Writing: A Memoir of the Craft by Stephen King (Obviously well known. He is not my favorite writer, but I think learning about his methods might be interesting)
Bird By Bird: Some Instructions on Writing and Life by Ann Lamot
I just remembered, while perusing B&N online and seeing a very familiar cover, I do have a copy of Thunder and Lightning somewhere. In a bag or a box. In the basement or garage. With all of my old Writer's Market and SCBWI stuff from a time before when I tried to be serious about my writing.
I have to rejoin SCBWI and now I'm going to make myself crazy trying to find that stuff. I guess it's lucky that we already have a snow day called for tomorrow!