Here is what they are promoting:
Pay what you want for Psychonauts, LIMBO, Amnesia: The Dark Descent, and Superbrothers: Sword & Sworcery EP. If you choose to pay more than the average price, you will also receive Bastion! Each game comes with its soundtrack in both lossless (FLAC) and MP3 formats.
Each of these DRM-free games works on Mac, Windows, and Linux, and can optionally be redeemed on Steam if you choose more than $1. Bundle buyers can also benefit the Child's Play Charity and the Electronic Frontier Foundation, non-profits doing excellent work in the name of gamers worldwide.