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Sometimes only a Windows PC will do, and OnLive Desktop presents a remote desktop on the iPad screen for access to Mcrosoft Office apps. The desktop interface works well by touch and since these are the full Office apps there are no compromises. It is a fast, easy way to work with Office documents on the iPad.
Free in the App Store
Storyist is a serious tool for writers of short stories, screenplays and other fiction. It is a self-contained app with tools for developing characters, story timelines, and index cards for notes. These are combined with a text editor to make it easy to write anywhere on the iPad, and even produce a properly formatted manuscript at the end. It is compatible with Storyist on the Mac, and features easy synchronization with Dropbox.
$9.99 in the App Store
I use Google Docs for working with many types of documents, and TouchDocs is a great way to interface with my stuff in the cloud. It combines an attractive interface with a solid editor that works with all file types supported by Google Docs. It enables working with documents anywhere and keeping them synced with Google Docs in the cloud.
$3.99 in the App Store