We are working on updating our instructions in favor of a direct download approach, which seems to be way better. Sorry about the iTunes favoritism!
-Jeff from Humble Bundle
-Jeff from Humble Bundle
(and no, I'm not affiliated with them, I just think they've built a great platform)
p.s.: i just saw that kindle is also on the appstore. So i may sync without itunes AND have it on my smartphone (android) and the ipad. yay!
I think this is a chrome PDF viewer issue. You may want to fix this.