How To Use iCal To It's Full Potential?

I've had iCal on my Macbook since I bought it 9 months ago and have used iCal on a moderate basis.
It's only been moderate because it never really hooked me to organizing my life within it. Usually I just use a pen and paper to jot down my priorities and events but I figure that's pretty lame, especially since I carry my Macbook everywhere.

Any suggestions on how to use iCal to its full extent?
Any possible programs or downloads to enhance my iCal experience?
Any advice would be great as I want to begin to utilize iCal on a daily basis.

thanks!