Good Calendar/Organizational Computer program?

Hey Guys!!

So I am MORE than in need of a good program for starting to organize things.. both design wise and life wise or I am going to become that mom who forgets things.. lol

I use a mac so i'd need a program that is compatible with that or something that is online..

I haven't really checked out google calendar, does that work pretty good?

Thanks chickies!

hmmm I was going to say I've heard GREAT things about google calendar, but I haven't used it either!