The app, still in early beta, lets you browse your Dropbox folder, download files to your phone, email files, upload files from the phone to your Dropbox and even take a photo and upload it to Dropbox, too. Still being built are features for copying and moving files, file sync, recording audio and video, and more.
Even better, the app, for now at least, is free. If you want to test it (remember, it’s beta!) head over the forums here.