Rated 5 out of 5 stars

per zer0rez el set. 5, 2008 ·

This light yet extremely robust calendar/reminder addon is deceptively powerful and is especially helpful if you work at your computer. Integrates nicely with thunderbird as well.

There is a brief video overview of it here:

http://www.youtube.com/watch?v=as9XUOFccGA

This review is for a previous version of the add-on (1.8).