Yesterday, I updated to iOS 4 on my iPhone (like everyone else), and downloaded iBooks. The iOS 4 is nice, pretty fast, and a welcome upgrade. But iBook was a disaster. I could go into the store, go into the "Purchases" tap, and redownload my books. It was a little annoying to have to do that manually, for each book, but I could probably manage. But, when I did so, I got this message "You've already purchased this but it isn't available for redownload. To purchase it again at full price, tap OK"