This is damned odd. A couple of books I paid for are missing from the iBooks app. These are books I actually PAID for that are gone. I'm about to look through my iTunes receipts, but I'm thinking WTH! I thought that we 'owned' them, and they wouldn't 'disappear'... It's Neal Stephenson's Snow Crash, not that it probably matters, but still... All of his other books are there, but that one. I looked through the purchased area of the iTunes store, and it's not that either.