Destinations of a useful and curious nature

Book Related Sites

Antiquarian Booksellers' Association of America (ABAA)
International League of Antiquarian Booksellers (ILAB/LILA).
Fellowship of American Bibliophilic Societies
RBMS FAQ of Book Collecting
Book History Online. Searchable database of bibliographical reference sources.
A Book Collector's Glossary
Bookbinding and the Conservation of Books
A Searchable Dictionary of Descriptive Terminology
RPS - Tremendous listing of over 5000 websites describing holdings of manuscripts, archives, rare books, historical photographs, and other primary sources...
The British Library - Amazing collection of Virtual Books displayed with turning Pages technology.
Cotsen Children's Library - Perhaps the greatest collection of Children's Illustrated Books ever assembled.

Art and Design related sites

London Design Museum
Art Deco News
Art Deco Society of California
The Twentieth Century Society
The Jazz Age
Instituto Art Deco Brasil
Decopix - The Art Deco Architecture Site
Art Deco: Artists and their Works
Art Deco Study Guide
Art Deco Everywhere
The Art Deco Book In France
Art Deco Bookbindings: The Work of Pierre Legrain and Rose Adler
Art Deco Bookbinding From Stanford University
The Koch Collection of Art Deco Bindings

Various noteworthy sites

Google Free International Translation