iOS: Dropbox has updated its iOS app with a handful of new features, including a handy new PDF signature function and an iMessages app. The most obviously beneficial new feature here is the ability to sign PDFs right from Dropbox. This should make it a lot easier to deal with signing documents on the go. Aside from that, you can now easily share Dropbox files directly in Messages with the new iMessage app. You can also create, scan, edit and upload files directly from the lock screen, as well as multitask on the iPad app. The update's rolling out today in the iTunes App Store.
Dropbox (Free) [iTunes App Store]