I am not equivalent to Bill Gates, i can not donate much in terms of money. I make my donations through my thoughts often, that comes in form of writing. I get paid for writing, as i am often hired as Ghost Writer and i have ailing family to take care. So giving away money is out of question. While today i thought to be little more generous as i was having fund in my MoneyBookers.Com account. I donated little money from this to wikipedia.
If you also have some funds, lying unused or can spare little from your pocket money donate it to wikipedia. Here are various ways for donation.