Bibliographical Society of America
Click on "Bibliography on the Web" for a searchable list of bibliographical resources.
The Library of Congress
The Library of Congress offers an excellent resource for information on caring for your collections:
As well as "Preservation Frequently Asked Questions":
Colorado Antiquarian Book Seminar
Annual seminar for Dealers, Librarians and Collectors, held at Colorado College in Colorado Springs.
Rare Book School
Independent non-profit educational institute offering non-credit courses at the University of Virginia, Grolier Club, John Hopkins University, et al.