Now they've released the Humbe eBook Bundle. You can get six books from the authors Cory Doctorow, Paolo Bacigalupi, Lauren Beukes, Mercedes Lackey, and Kelly Link. If you pay more than the average you also get Signal to Noise by Neil Gaiman and Dave McKean, and Old Man's War by John Scalzi. With the Indie Bundles they usually end up adding other bonus content later on, so you never know, there may be more!
You can decide how much of the money you spend goes to charity, goes to the authors or goes to Humble Bundle, so go and spend some money and feel good about it!