For any file in your Dropbox folder, this workflow shows the dropbox short link URL (e.g. http://db.tt/1LkWGVJF) and copies the link to the clipboard (Cmd+Shift+D):
1. Select a file in Finder (must be a file within your Dropbox folder, e.g. ~/Dropbox/Photos/MyPhoto1.jpg)
2. Press Command+Shift+D
3. Authorize the workflow to use the Dropbox API (only if this is the first time)
4. The shortened link pops up and is copied to the clipboard.
It uses OAuth in the background to connect to Dr