A post from 025.431: The Dewey Blog points to several innovations in print collection visual presentation — the Dewey Cloud from U Adelaide Library is particularly interesting and available at http://library.adelaide.edu.au/local/dev/deweycloud.html. 

"This page provides a visual presentation of the Library’s print collection. Dewey Classification headings are ranked according to the number of items under each heading. Ranking is indicated by a larger or smaller size : the larger the text, the greater the number of items. Moving the cursor over a category will reveal the Dewey number and number of items in the category. Clicking on a category will link to the Library Catalogue to browse that category."