Bibliomania
For book collectors, or just book lovers, a vast collection of links covering topics from book repair to identifying first editions.
http://bibliomania.net/

Information on Facsimile Books
An introduction to facsimile books, faithful recreations of the original.
http://www.ozemail.com.au/~finns/introfac.htm

A Guide to Book Collecting in the 21st Century
Information on beginning or sustaining a book collection (Alibris.com).
http://www.alibris.com/articles_features/articles/gozdecki/gozdecki-home.cfm/

Collecting Telephone Books
The story of an uncommon hobby.
http://www.statoids.com/phonebooks/pbcoll.html

Bookseller World
Bibliographies, articles and guides on book collecting and dealers.
http://www.booksellerworld.com

Exlibrisland.com - bookplates collecting and exchange
The ultimate source for exlibris collectors. Art of bookplate collecting. Bookplate magazine: history of ex-libris, bookplate today, ex-libris personalities - artists and owners.
http://www.exlibrisland.com

The Bookplate Society
An international society of exlibris collectors, bibliophiles, artists, heralds, family historians and others dedicated to promoting the design, use and study of bookplates
http://www.bookplatesociety.org

Book Terms Illustrated (powells.com)
A helpful photograph accompanies each book term, along with its usage. Guide also outlines condition criteria.
http://www.powells.com/rarebooks/bookbasics.html

Guide to Rare and Old Book Values
Collectible book value guide, author autograph guide, eBay auction book selling tips, and book collecting links.
http://fadedgiant.net

Classic Crime Fiction
Highlights crime and mystery books, both from the reader's and collector's perspective.
http://www.classiccrimefiction.com

NPR : List of Top Out-of-Print Books Offers Surprises
Books on politics, sex and knitting are among 2004's most wanted out-of-print books. NPR's Renee Montagne and Steve Inskeep discuss the Top 10. [1:27 streaming audio broadcast]
http://www.npr.org/templates/story/story.php?storyId=4196561