Quicksheet is a great tool for iPhone.
You can access your iDisk, setup a public folder from a friend’s iDisk, download documents, edit them, upload them again, create spreadsheets and much more.
Its not a free app, but its worth every cent.
Say you worked on a pages doc at home, and you want to mail it to your friend. Once the doc is on the cloud, just download it from anywhere, review it, and mail it for further adjustments.
You can also do this with photos, movies, pdf’s and almost anything you can put in your iDisk.
Check the pictures:
And download it at the app store.