A global JavaScript add-on to insert additional menus into the main navigation toolbar across the top of the screen. The contents of the menu can be customized in the a MySQL database.
Should CanvasHack ever get finished enough to support GUI configuration, this plugin really needs it. Right now there's some commented-out code in the common.inc.php file that demonstrates how to define add-in menu items. Right now the only variable that gets replaced is the current user ID (@USER_ID),