CoolReminder is a great reminder software with lots of features and very nice and friendly interface. Being in your tray-bar it reminds you of all your plans and events, calculates a number of days between two input dates and 'wakes you up' with its alarm clock that you can modify with your own WAV or MP3 sound file. With CoolReminder you'll never miss a thing you've planed before like friends birthdays and so on.