Honestly, I don't want your money. This calculator doesn't use much bandwithd and I'm on a multiple year contract with this website. I don't need any money to keep this site up until 2009 or longer. So don't send me anything.
If you really want to donate to something, donate to Tread Lightly or some other deserving off road organization.
So enjoy this site free of charge. Tell your friends about it too.