So, what I did is I bought myself the Apple Wireless Bluetooth Keyboard and a stand for my Iphone and I bang out a few words at lunch every day--I write every day. I tried using the Pages app, but it has no landscape orientation and doesn't zoom in the way I'd like (unless you have an Ipad, save the 10 bucks for something else). I now use My Writing Nook, which allows me to sync the things I'm working on with my phone and on any computer I happen to be in front of (like the one I have at work...) through www.mywritingnook.com. So try it; I think you'll be surprised and impressed.
But Word Processing? You can do that on just about anything. It seems like such a waste to use something so fancy to process words. Yeah, well, you can use it for other things if you really want to (phone calls, email, browsing, Facebook, Twitter, Goodreads, Words with Friends, Chess with Friends, Amazon, ebooks, etc., etc., blah, blah, blah), but just think how convenient the damn thing is for writing your next novel--it's worth the exorbitant fees you'll have to pay every month and living on Ramen noodles and frozen pizza for a while...right?