Good Gear Guide
In Pictures: The best office apps for your iPad, r...
Cloud storage (tie): Box
Like Dropbox, Box enjoys wide support from iPad apps, and it works in Windows, OS X, and Android. But Box does not have the simple integration with OS X and Windows that Dropbox does, forcing you to move files through a clumsy Web interface instead. Box can be used with Apple's iWork suite on the iPad for no additional charge, and it offers an enterprise version that lets IT manage access and content rights for corporate data.
In Pictures: The best office apps for your iPad, round 4