It looks like the Humble Bundle crew is branching out to other art forms, as they've introduced an eBook bundle. This seems to follow the same formula as their previous game bundles, there's a base collection and you can get more by paying extra.
Pay what you want for Pirate Cinema, Pump Six and Other Stories, Zoo City, Invasion: The Secret World Chronicle (with extras!), Stranger Things Happen, and Magic for Beginners. If you choose to pay more than the average, you will also receive Old Man's War and graphic novel Signal to Noise!
Eh, not getting this myself.