Apple certainly was inspired by the look of Delicious Library but I’m not upset to have influenced them. For me the whole point of UI design is to move the state of the art forward for everyone. I’d be disappointed if Apple didn’t take my interface and use it, it’d mean Mike and I kind of failed.

I mean, I didn’t invent the push-button, but I use it everywhere in my apps, as we all do. Someone, somewhere invented it first, and I thank them.

It is of course certain someone at Apple had seen Delicious Library, and likely one of the people who had seen that design were involved in the original iBooks. But there is no functionality overlap with Delicious Library - DL was about cataloging media and managing loans, not accessing digital media itself. I was not able to add a digital book or movie to DL, nor could I make a reference to a physical book or movie I own in iBooks.

But its also not like there were that many skeuomorphic UIs for managing books. Actually two - a bookshelf showing spines, and one showing fronts. And if you are going to maintain a picture of the front, you're probably going to want to show it by default.