Once installed on your device, Dropbox for iPhone provides access to all your Dropbox files, allows you to view any file supported by your iPhone (including documents, photos, music, and video), uploads any photo or video you’ve taken on your device to your Dropbox account, and lets you save any file as a favourite for offline viewing. If you want to share a file in your Dropbox with someone else, the application can generate an email with a link directly to the file.
In short: If you’re already a fan of Dropbox and you’ve got an iPhone or iPod touch, you’ll want to download this app. Like the Windows, Mac, and Linux versions, Dropbox for the iPhone is freeware and requires only a Dropbox account.
Dropbox [iTunes App Store]