Calendar program?

Does anybody know if there is such a thing as a calendar/planner-program for the computer ( mac) and where to download it?
That it starts up immediately when you start the computer.
I have discovered that I don't use my regular calendar ( don't write down important info, don't look in it to check if there was something I should do..) as much as I actually need to. Then I got thinking that if I had a calendar on my desktop that each day would display the events of the day, or week, then I would use it better and also have more control over my increesingly blurry existance.

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Here's a list of them:

http://download.com.com/3120-20-0.html?qt=Calender&tg=dl-20&search= Go!

Most are for windows, but I see a few listed there for Macs.

 

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Thanks, any recommendations on which one to use?
I tried iOrganizer, but it wasn't really what I was looking for.
Something more looking like a regular calendar...

 

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Never used any of the Mac programs. Although I find that user opinions are usually very accurate.

The program that I use (*sometimes*) came bundled with linux. It's called 'KOrganizer' and has a lot of neat features.

Have you looked into a PDA? They're a lot cheaper these days and much more pleasing than paper.