Write! Reader Companion App (Android, iOS)
So much of writing happens as you are rereading and thinking about what you've already written. It is, therefore, a pity that in order to access your Write! files you need to be in front of a PC. It would be great if there was a reading companion app that would allow you to read the stuff that you have written on mobile devices.
This way you could write your essay or article and then read it and think about ways to improve it on the train or anywhere else away from keyboard.
Also, a reader app may be easier to implement than a fully-fledged app with all the functionalities of the software. Personally, if there was a complete mobile Write! app at hand I would not use it much for writing (I prefer keyboard and a distraction-free environment) or note-taking (I am happy with Evernote) and would end up using it for rereading anyways.