Writers: Mac or PC?

From Goodreads

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?

iPhone 5: 2 Screens?

It's no secret that rumours about Apple's iPhone 5 have been running rampant on the internet these days. Now, you may recall that in the past month, there was a huge discussion going on about a sliding component to the iPhone 5, which many people speculated hinted at a slide-out keyboard.

Now, that [mock-up] definitely looks a) bizarre b) impractical and c) not very Apple-esque. Honestly, with the built-in keyboard, having a chunky, physical slide-out keyboard makes zero sense. BUT -

Could the sliding component possibly indicate a second sliding screen? Think Nintendo DS-style - a secondary screen that could be used or hidden at one's leisure... It would contribute to multi-tasking, it would expand the amount of screen space usable, it would make a hell of a lot more sense as an explanation for the sliding mechanism than a physical keyboard...

What do you guys think? Is it possible that the iPhone 5 will carry a secondary slide-out screen?

Disclaimer: Obviously this is just speculation on my part; I'm not officially affiliated with Apple in any way.