When I first visited Shannon Hale's site, I was ecstatic to find her writing advice. No author website I'd visited before had something like this. I've provided a direct link to her specific section on writing, but feel free to explore everything else, too.
Last fall, I officially explored Ally's site and found that lovely webpage linked to above. It was during NaNoWriMo, I think, and I spent several hours one evening reading everything she had to say. It's all very useful information, so please check it out if you're a writer!
Usually, every time I read something from a new author, I go check out their website. So I checked out Marissa's on Tuesday afternoon and quite enjoyed myself. I saw she had some good writing advice (I think it was in her blog posts, so you'll have to skim to find the posts you're looking for).
I hope this is helpful for any fellow aspiring authors. :)