I don't know if it's just me - but since doing the newest JB on my iphone 4 running 4.2.1 ibooks is completely useless. The app will start, but books won't open, no matter what kind of tricks I do or how many times I do them. I even tried reinstalling the older version (1.1.2), no workee either. With the Redsn0w jailbreak, ibooks was buggy and crashy but at least was useable - you could always get the books to open eventually. I'm going to do a restore in the morning, as I'm nearly through the book I'm reading and it's not available on any other book platform. Anyone have a fix?