I just pushed the code to handle folders in my Dropbox Dropzone to GitHub. If a folder is dragged on the Dropzone it is now archived and uploaded to Dropbox as an archive to be shared.
Enjoy :)
PS: Love those guys at Aptonic my changes got pulled minutes after I sent the request.
Edit: Updated again to also handle multiple files dragged on, they are also zipped now instead of producing an error. Waiting for Aptonic to pull, but I guess it will be up shortly