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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.
This app is another full-featured editor that has features for those who write for the web. It supports Markdown and can export into HTML to make rich text articles ready for online publishing.
There is an integrated Quick Research feature that provides online searching within the app in a pop-up window. This can even do simple math calculations on the fly by entering the equation in the search window.