Check out G-Alarm. It can do multiple alarms and it's very easy to activate/deactivate alarms. It also has a today plugin and you can download different skins. You can also set it to require you to finish a maze to turn off the alarm.
http://www.ageye.de/index.php?s=galarm/about
http://forum.ppcgeeks.com/showthread.php?t=37892