I have created a (very beta and somewhat hacky) SMS notification app for Kayako's helpdesk. The app allows a company to have a designated "On Call" staff member who receives SMS summaries of new tickets / tickets awaiting reply. SMS notifications are done via email-to-SMS gateway. The plugin is free to use, distribute, and modify under the terms of the GNU General Public License. I hope this is useful to someone in need of similar functionality. Someone with rudimentary PHP knowledge (such as myself) could modify this to send a variety of notifications. Someone with excellent PHP knowledge might even be able to make the code legible.