Alarms is a very handy utility that lets you schedule reminders by just dragging any file or url to the OS X Menu bar. Optionally it lets you sync with iCal and display Address Book birthdays.
* Simple and fun
* Requires minimal amount of discipline
* Notifies you of birthdays
* Syncs Tasks with iCal™
* Supports Growl
* Customizable keyboard short cuts
Intel, Mac OS X 10.6 or later.