I still don't think most devs know what to do with the 'hamburger button'. Although some follow Brichter and use it as a handle to slide a side panel out, I've also seen it used strictly as a toggle to slide the same pannel out (OSX 10.8, OrderAhead). In other cases, I've seen it used to just reveal a popup options menu (Chrome) or act as a handle to reorganize lists (iOS).
Some consistency here would be nice.