I'd like a good calendar app that does things like...

I'd like a good calendar app that does things like color-code events, remind me of dates (when I log on or start up, even if the calendar isn't running), and come with stuff like major holidays pre-coded. That's why I'm not happy with the WOrks Calendar.

Oh, and I'd like it to be free, and Windows XP comaptible. I've done the searching, and am so far empty-handed. Do you folks use anything you'd recommend?