Over at Social Apples, a recent 4.2.1 jailbreaker noticed something disconcerting after firing up iBooks on his newly liberated device. Many of his ebooks didn't work.
Tagged With greenpois0n
It's a couple of days later than we thought, but it's well worth the wait; if you're running iOS 4.1, the GreenPois0n tool has been set loose for your jailbreaking pleasure. It's a Windows-only release for now - something they're hoping to correct "soon" - and supports iPad, iPhone 4, iPhone 3GS, and the third and fourth gen iPod Touch. Upcoming releases should support second-gen Apple TV. Go ahead and set your device free.