My hubby's friend came to him with this and we both jumped on board but quick:
Basically, you pay any amount you want and depending on how much you do, you can get upwards 6 games (or audiobooks, apparently)!
The games and deals are pretty sweet-- sometimes you can even get games that are upwards $60 for a mere $10, along with other games.
Edit to add: I forgot to mention that the money goes to a charity. That's pretty much the entire point of Humble Bundle, and I forgot to add it-- go me...
Just thought it might be worth mentioning... heh.