Best Books of the 20th Century

Modern Library's 100 Best Novels Lists
Random House Publishing
http://www.randomhouse.com/modernlibrary/100bestnovels.html
100 twentieth century works written in English
Professional Board Selected List & Reader's Poll List 

Modern Library's 100 Best List -- Annotated 
Includes partial summaries, overviews, or reviews 

Modern Library's 100 Best List -- PCC Shelf Locations
Word File

Library Journal's  List
150 twentieth century works written in English, ranked, limited to fiction 
http://www.stanford.edu/~bkunde/best/bl-slibj.htm#T
Annotated list of Library Journal List

Nobel Prize for Literature

Pulitzer Prize

ReadBookOnLine.net
Some of the ML's 100 are available online!