I write like is a pretty neat little tool and surprisingly precise. I haven't read either of the authors it says I write like so I cannot say how accurate it is but I can definitely say it is precise.
Most of the time I paste in a blog entry, it says I'm like this Canadian blogger, eh. The rest of the time, it says I'm like some science-fiction writer/essayist. Even if the comparisons are totally, horribly wrong. Just having metrics capable of consistently mapping one person's writing to one or two other people's writing is worth a golf clap.
Rock on, guys. Rock on.