Reminder fox to keep track of your todos
ReminderFox is an extension for Firefox and Thunderbird that displays and manages lists of date-based reminders and ToDo's. ReminderFox does not seek to be a full-fledged calendar system. In fact, the target audience is anybody that simply wants to remember important dates (birthdays, anniversaries, etc) without having to run a fat calendar application.
Download it at http://reminderfox.mozdev.org/
Images: Reminder Fox