To navigate using a window's proxy icon under Mac OS X, command-1 or control-click (or right-click) on it, which will pull down a sub-menu showing the window's path. If you release the command or control key and select a folder or drive in the sub-menu, the window will jump to that location. If you hold the command or control key while selecting a folder or drive in the sub-menu, a new window will open for that location.