One of the people who I don't know personally but admire a lot in this regard is Derek Sivers (creator of cdbaby.com). If you've got 5 mins, you'll just love reading this article by him "Why I gave away my company to charity" [1]
I was listening to his audio-book and in the end he tells his story where he gave all of his money away (I think it was like 95% of the money away to create an institution for up and coming artists). It's just truly inspiring.