I heard about this idea a while ago - a bookshelf that doubles as a place-holder for your current read. It was described to me as a shelf that looked kinda like a birdhouse.. I finally came across a pic of the design in visi. Their latest cover is scratch and sniff!
The bookshelf is designed by David Restorick and you can see more of his work on his flickr page.
He's also been featured on design spotter "The bookhouse is a bedside unit. Somewhere to place your book as you fall asleep, keeping your page, as well as providing essential storage inside. Availiable in Azzure, duck egg blue, pink and white."