It's still surprisingly hard to get rid of books, even if they are supposed to be redundant. Here are six bookcase designs for the book-loving pack-rat:

Six Space-saving Ideas For BibliophilesS

[Antonio Lupi's design for a bookcase in a bath is via Boing Boing; the staircase bookshelves were published here on Gawker; and the other designs are stolen from Freshome's collection.]