DayMate (formerly Remind )  

DayMate (formerly Remind!) is a versatile intuitive day planner. This profesionally developed and well designed application allows to create and schedule reminders than can pop up messages with optional sound effects; start applications or open documents; and shut down, reboot, or power down your system. It can also check for new e-mail, dial phone numbers, synchronize system time via the Internet, send messages, and open a specified Web sites. You can create single or recurring events, color-code different item types, set reminders for upcoming events, and more. A drag and drop feature allows you to easily reschedule an event or change its duration.