Red Alarm Clock is a Dashboard widget that features a digital alarm clock that will raise the volume as it plays your favourite tracks from your iTunes library, to wake you in the morning. Just set the time using the digits on the front face (or your keyboard) and press the alarm button.
Flip the widget to set the iTunes playlist to play and the maximum volume at which you want it to wake you. To deactivate the alarm, bring up the Dashboard and press the alarm button again.
Installing: Make sure you enable your Energy Saver Schedule function, so that Red Alarm Clock will always have a chance to wake you. To do this launch System Preferences, then click on Energy Saver, then click on the “Schedule…” button. Tick the first checkbox, that says “Start up or wake”. If it’s already ticked, then you’re set. Click “OK”.