The Humble Indie Bundle is currently on sale for any price you want to pay and you can even determine how the contributions you make get distributed between developers and charities.
I can't comment on the quality of the games but the principle excites me so why not check them out? Thanks to Oltman for pointing out this deal!
The basic features are as follows:
- Cross-platform (LINUX, Mac OS X, Windows)
- Pay what you want
- Support charity
- DRM free (install as many times as you like AND redeem them on Steam and Desura)
A video of the bundle is located here: