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This app is a tool for serious writers, designed to handle complex novels and screenplays. In addition to an editor designed to handle large writing projects, Storyist handles all facets of the project to keep the author on top of the action.
There is also a Mac version that syncs with the iPad app.
This app is a graphical notebook for the most artistic projects. Information can be typed anywhere on the two pages displayed at all time, or scribbled by finger/pen can be done.
The Tapose interface is one of the best for touch on the iPad or any tablet.
Google Docs is a good cloud service for working with documents including presentations and spreadsheets, and TouchDocs is a wonderful way to do that.
The iPad interface of TouchDocs facilitates finding the document needed in even big archives, and the editor is a joy to use.