So I've purchased quite a few books for my iPad2 but not through the iBookstore. They are all the .ePub format and read great on the iPad but for some reason won't tansfer to my PC in itunes. Although iOS 5 is a bit far off, I've heard from a friend that when she upgraded iOS (this was a while ago) all of her purchased books were deleted from her iPad and I would hate to have that happen to me. Had they been synced in itunes that wouldnt have been a problem... any help on how to sync to these books itunes????