I think I did come across that one, though I didn't really look too much into it.  It looks like it's more strictly writing, though being able to access with wifi might be helpful.  I did end up buying an iPod touch, and I got the Auteuriest app, which is pretty neat.  Wasn't really able to do much with it right off cause the copy/paste wasn't working right, but got an update that fixed that last night.  I like it because it's got sections for characters, places, research, all that fun stuff.  Which is usually what ends up causing me problems if I'm not at home.  I forget names and stuff and can't refer to notes when I don't have them.  And I've found the notepad to be really helpful when I get random thoughts at work.  Plus the fact that everything syncs with my Mac, so I don't have to do anything but hook the two up.
And looking into mywritingnook more, it requires a google account, and I think I already have way too many different accounts already.