If, like me, you enjoy listening to music on your mac as you fall asleep but have an irrational fear of the continuing sound preventing you from hearing your alarm in the morning, then give iWannaSleep a try.

Wind the circular slider to the desired amount of time, start up iTunes and go to bed. Once the timer runs out, iWannaSleep can turn off iTunes, sound an audible alarm, shutdown the computer, or run an applescript of your choosing. Simple, yet effective.

Other possible uses:

• egg timer
  
• pizza timer
  
• timer to be sure the sprinklers are actually on for the eight minutes you'd set them to be the day before with the panel in the frontyard after receiving a drought restriction notice in the mail from the local water authority
  
• other things