Are you sure you even need it? You can switch between input modes using a keyboard shortcut. Just cmd-click-n-drag the flag out of the menu bar.
OS X includes a couple of handy utilities for dealing with symbol characters in fonts—you know, things like the copyright symbol (©), the divide character (÷), the registered trademark symbol (®), and ...
<p>With Snow Leopard, Apple changed the "International" preference pane organization, and also altered the input menu icon so that depending on the options in the menu, it removes the country flag.
Your Mac’s menu bar is a useful tool. It displays “menu bar extras,” little icons that give you status information about your Mac, or that offer quick-access menus to certain settings. For example, ...