In case you don't what Humble Bundle is, it's this limited sale of games in which you can pay any ammount for the games (as little as 1$), and you get the official games, plus their soundtracks (and they're also giving the source code for Jack Claw). Not only that, you can install them in any computer you want, any number of times. They also provide codes for Steam and the such.
Another defining feature of the Humble Bundle is that you can choose what your money goes to. You can choose to give it all to the developers, or all to charity, or distribute it yourself.
I've already bought mine, try to get yours before the time is out!