There was an interesting case of bibliomania in Germany I read about in the Salzburger Nachrichten, in the mailinglist Inetbib and in Yahoo News: Because of an alleged pipe burst, the fire brigades opened a flat in Kaiserslauten. But they had troubles with entering, because the whole apartment, including the bathroom, was crowded with books up to the ceiling. Only to the kitchen which seemingly also served as bedroom, a small passage was left void. As the building was acutely impending to collapse, the fire brigades and the police had to remove several tons (!) of books and store them temporarily in a depot. When the owner came home in his also crowded car, he suffered a nervous break-down and had to be supervised by a psychologist, as he couldn't bear the evacuation of his beloved books.
Apropos: You can read an article in the magazine "Spiegel" about the "Messie-Syndrome" or Eugene Fields "The Love Affairs of a Bibliomaniac" online at the University of Virginia Library's Electronic Text Center.