I often find myself highlighting several files, compressing them in Finder, and dragging the zip over into the Dropbox public folder, and finally, copying the public URL.
For something I do frequently, that's a pain in the arse. It would be neat if we could build a file action for this.
Edit: maybe copying the public URL to clipboard at the end is a bad idea, because uploads can take hours. Perhaps an alert with the option of copying the URL?