Humble Indie Bundle V was started yesterday.
Pay as much as you want (really!) for getting 4 brilliant best-selling cross-platform (Mac/Linux/Windows) no-DRM games with soundtracks included. Part of your payment wil go to charity:
The Electronic Frontier Foundation and
Child's Play Charity. You could distrubute your payment between charity and game developes in any ratio. And if you'll pay more than average, you'll recieve 5th game.
Disclaimer: I personally like one of included games very much.