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Book Browser
"BookBrowser is a site dedicated to reading. We offer fiction reading lists, forthcoming titles, author information and much more. We made BookBrowser to help avid fiction readers and authors find each other."

Bookwire
Bookwire is a comprehensive site about books and the book business, including links to other book sites.

DealPilot
Search across and compare prices and other information between Internet book, music, and movie sellers.

Modern Library 100 Best Novels
Modern Library 100 Best Nonfiction
Radcliffe Publishing Course the Century's top 100 Novels
Guardian The top 100 Books of All Time (Fiction, unranked)
Hungry Mind Review 100 Best 20th Century Books (American)
Here are several of the “best books” lists.

Book Review Sites

Booklist includes Reference Books Bulletin
Here is the "digital counterpart of the American Library Association's Booklist magazine..."