So I was on Goodreads just now, when I spotted this photo of J.K. Rowling with the caption "J.K. Rowling at her laptop", holding what is clearly a white Sony VAIO (aka a PC). I mentioned this to a friend, and he immediately commented that "that is rare; nearly every writer uses a Mac these days." Now, I'm wondering how valid of a claim this is. So let's have a poll. Chime in, writers, aspiring writers, agents, publishers, bloggers - anyone in the book industry - what do you use, Mac or PC?