iOS (Jailbroken): One of the problems with the iPhone is that you're stuck using iTunes if you want to import any media files. Bridge is a new jailbreak app that removes iTunes from the process and allows you to import files from email, Dropbox and other services.
You can import any media file you like from Dropbox, or even by copying and pasting a link into Bridge (or use the "Open In..." button in Mail or Safari). Once media is imported, it's moved over to either your Music app, Podcasts app or your Videos app. If you've ever wanted a simple way to instantly import media into your native iPhone libraries, then Bridge is worth checking out.