Welcome to the Apple iPad Forum, your one stop source for all things iPad. Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
When you mark something as favourite in the Dropbox app, it can also be viewed offline:
My screenshot shows an mp3. This works with every file that can be opened in Dropbox, afaik.
Hope that helps.