We've just published the first beta of BoxFiles for Dropbox Mango edition :). The beta is available at: zune://navigate/?appid=8cfa8f66-3174-48e1-99b5-f2d0146113e8 and is limited to the first 100 users that will download the app (if we reach that limit and we still have requests we can publish another beta). We've rewritten most of the source code so it needs a good testing and some feedback. Send your problems/suggestions to: firstname.lastname@example.org .
The Dropbox library was rewritten from scratch taking out all the 3rd party components (JSON.Net and Hammock), but the featureI am most proud of is the integration with Skydrive. You can now upload your modified Office files back to your Dropbox account.
We need your help to make our product better. If you can, please tweet the link.