In reply to kipper12: just to say that iPad works really well with word docs through Pages and it is easy to export as word docs through the mail programme. It is annoying though that when exporting to Dropbox you can't navigate he folder structure, only export to the main Dropbox folder. It reads PDFs fine and there are apps in which ou can annotate PDFs although I prefer old fashioned hard copies and a pen!
iOS is way better than osx on all this!