I lost the link where I found this but doesn't it look like fun?
"Stairs Bookshelves: What started as a space-saving strategy turned into a centerpiece of this interior redesign. The experience: complete book-overload as the London owners make their way to the loft bedroom above the main floor of their condo. Shot from virtually any perspective the result is remarkably attractive and a good reminder that a lack of space can be a great design opportunity."
More clever book ideas here!