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The Apple iPad can be a very useful work device and with the latest crop of Office capable applications you can possibly leave the laptop behind. In addition to Apple's iWork suite, the Mobile Gadgeteer blog post includes a video walk through Documents To Go, Office2 HD, and Quickoffice.
Pages is very intuitive to use and includes all the common features you need to create and edit documents.
You generally do not think of spreadsheets as being much fun, but Numbers makes the experience quite enjoyable and is the only application available that lets you create charts in the spreadsheet program.