You can give it away while you're alive, or split it between your loved ones and the state when you die. I think it would be more fun giving it away to those most in need rather than enriching those who've already had a pretty good life... and your loved ones, too.
perhaps, but if you teach and educate your children how they can duplicate your success, and give them a headstart with the fortune you've built, then you can do just as much, if not more, than the charity down the street.
Look, I'm not advocating against giving, but I don't think jumping into pledges is the smartest way to begin.