Dropbox for iOS 2.1 update adds a PDF viewer and file share notifications.
The update, which requires iOS 5.0 or higher introduces a new PDF viewer, file sorting by date modified, and push notifications for when someone shares a folder with you (which were also recently added to the Android client). Whether you’re a Dropbox power user or the casual type, this new software bump should definitely come in handy.
Download: https://itunes.apple.com/us/app/dropbox/id327630330?mt=8