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Writers often need to check on things while working, and Writing Kit has an integrated web search that works without leaving the editor. You can check on that important fact right in the document you are editing, and incorporate whatever you need. The app also exports work in a variety of formats, including HTML for online publishing.
A toolkit of productivity apps wouldn't be complete without Keynote, a great presentation tool from Apple. Keynote looks amazing on the Retina Display of the iPad, and can handle many Microsoft Office Powerpoint presentations for those work projects that require it.
Crunching numbers in a spreadsheet may not be a favorite pastime, but sometimes you can't avoid it. Numbers by Apple is a Retina Display optimized app that makes spreadsheet work as easy as it can on the iPad. The app can handle many Microsoft Excel spreadsheets for those needing to work with those files.