I'm virtually done installing Windows 7. That included reinstalling Firefox and some Firefox plug ins.

During that process, I was "reminded" how valuable the "ReminderFox" plugin is to me.

With ReminderFox, I just don't worry about forgetting an important appointment, birthday, etcetera. Each time I start Firefox, a small note appears for a moment in the lower right corner. It reminds me of what I need reminding of. The intelligent software knows when to give me a day's notice or weeks notice -- like for birthdays so I have time to buy a gift.

But, its NOT a "Calendar" application. Its WAY easier than that.

ReminderFox for Firefox

FWIW