The iPad has been characterized as a device that's more for consuming media than for productivity. Yet there are a lot of people out there who are intent on using it as a computer. And there are an increasing number of productivity apps. Macworld has a great comparative review of office apps for the iPad. The article's author, Galen Gruman, concludes with a list of productivity apps that he feels should be the standard installation on corporate iPads: Pages, Numbers, Keynote, GoodReader, and ZipThat. He favors the Apple apps over those in other suites, but gives an alternate list if you're someone who is stymied by Pages' lack of style-sheet retention.