The games are: Psychonauts, Amnesia: The Dark Descent, Limbo, Super Brothers: Sword & Sworcery EP, and the Bonus game for paying greater then the "Average Payment"* is Bastion.
All games are DRM free, pay more then $1 to unlock Steam Keys for your games and soundtracks are available in FLAC or MP3 with your purchase as well.
Games are available for Windows, Mac, and Linux.
New this time around is the ability for Ubuntu users to get their games via the Ubuntu Software Center.
Remember you can chose how to split the donation between the Developers, the Charities (Child's Play and Electronic Freedom Foundation), and the Humble Tip (for server costs and other expenses)
*as of this writing the "Average Payment" was $7.82 (US Dollars)