I’ve taken inspiration from Leo Laporte’s “hotclock.scpt” and have developed a TWiT Army Notifier. This script requires Mac OS X, Quicksilver, and (optimally) Growl. All of this is free.
To execute this you have to open the Script Editor in the Application folder, copy and paste the following code into the editor, then press Save As under the File menu. Select Application and check the ‘Stay Open’ option…