Dropbox Sync API for Mobile Developers
Get ready to add some Dropbox magic to your apps with the Sync API for iOS and Android, a powerful new library that makes it easier than ever to sync with Dropbox. The API takes care of all the complexity around caching, syncing, and working offline so that you can focus on creating the best mobile apps—it’s like having your own private Dropbox client built right into your app!
The syncing works with app-specific folders. It would be great if Dropbox had a companion SDK for Mac OS X.