[whpalmer4]

An example would be a phone call to someone in a different time zone. You don't have to call them at some specific time, but you don't want to call before they are at the office/awake/whatever. So you put in a start date (and time) and go about your other activities, and you get a notification when the time comes to remind you that you've got a new task ready for action.

The desktop version gives Available notifications through Growl...