Here are my (crappy) notes:
* The golden rule: read a lot, write a lot.
* Have a place for only writing and concentrating. Do nothing else there.
* Everyone has an innate talent ceiling. A good writer won't progress beyond being a merely good writer.
* Story > plot. Stories can 'write themselves,' it's hard to plan up front.
* He doesn't write for symbolism or metaphor directly, but may notice it as he's writing and fold some in.
* Let the first draft age for a while before revisiting. His ideal time is 6 weeks.
* "Kill your darlings." Aka be willing let a concept go even if it seems great.
* Have an ideal audience in mind when writing. He says that his is 1 person - his wife. He says it should be 1 person.
* 2nd draft = 1st draft - 10%
* He's not a fan of adverbs
* Research is inevitable for backstory. He wanted to write a story that took place in a specific location, so he went there to see how it was so he wouldn't get things too wrong. He doesn't worry about it too much though, unlike a writer like Tom Clancy.
* He writes because he likes to, ostensibly not for money or anything else
* He gets a TON of angry letters and criticisms, particularly for his use of vulgarity.
* A lot of characters are based on people or stereotypes he encountered in his working class upbringing.
One thing that struck me is how much he reads. He had a list of suggested books to read in the back page, and there were probably hundreds
Obviously not all of the points apply to all types of writing, his list is very King-centric. If you've ever read him then the points will make more sense in context. For example, story > plot is definitely a "king-ism" since his stories are off the cuff and meandering. I couldn't even get through half of the Dark Tower series since it seemed like the plot wasn't going anywhere. In any case, I don't think you'll get very far writing software without identifying some of the "plot" up front.