Use Microsoft Office 2010 on your iPad. Seriously. Today and for an unknown amount of time...it's free!
CloudOn lets you use your iPad to create, view, and edit files directly in Word, Excel, & PowerPoint. The applications work the way you expect them to, and your files will look the way you want them to. CloudOn automatically saves documents as you're working on them to avoid losing your changes.
Want more? Of course you do!
CloudOn integrates with Dropbox to manage your files. Open them, edit them, and save them right in your workspace using your Dropbox account. To use CloudOn you must have a Dropbox account, which is also free.
With the ability to access, edit and store your information, CloudOn is the essential productivity tool for your iPad.
I haven't used this myself yet, but I've heard good things. Might as well grab it while it's free and trash it later if you're unhappy! :)