Calendar application
 

What calendar application do you use? Do you use something like Sunbird or iCal (if you're on a Mac, anyway), or do you just use the built-in calendar in another applation like Outlook?

For awhile now, I've sought a good calendar application for Windows, but I never seem to find one I like. Sunbird seems too empty, like it's missing something. (This is hard to explain...) Outlook is... not my favorite thing in the world. Once, I thought I had found something great in Chandler, but I realized that it is a serious resource hog. (80MB of RAM used before the interface has even loaded, way to go!)
For the time being, though, I use Sunbird, mainly because it works. I'm interested in finding something better, though.

This probably isn't something you are looking for, but I use Excel to keep track of everything I need to. I usually dislike most calendar programs, they are either missing key things I want or are way too bloated, so I'd rather just manage everything myself.

I use an application called RainLender

I might try this, as it seems easier to be able to type in whatever I feel like (and in whatever format).
Thanks for the suggestion.