Useful book sites

I just came across one of the best ideas ever, and it's something I really love:
What was that book? - a LiveJournal community devoted to helping people find the books they once read.
Here are some more:
A book site I visit on daily basis is the Book and Reader forums. A lot of the people on my friends list also come from there.
Literature Map. A great site for finding new authors based on the ones you like, or just seeing how similar authors are listed as.
What are the best book-related sites you use/have come across?
What was that book? - a LiveJournal community devoted to helping people find the books they once read.
Here are some more:
A book site I visit on daily basis is the Book and Reader forums. A lot of the people on my friends list also come from there.
Literature Map. A great site for finding new authors based on the ones you like, or just seeing how similar authors are listed as.
What are the best book-related sites you use/have come across?

Here's one:
FictionFinder
You can search for (fiction) books by subject, author, title, subject, genre, character, place or setting, etc...
FictionFinder
You can search for (fiction) books by subject, author, title, subject, genre, character, place or setting, etc...

A couple I like (a few aren't useful but still nice)
Book Browse
Literary Awards
Literature encyclopedia
people reading
Literature Network forum
Book Club forum
Book Browse
Literary Awards
Literature encyclopedia
people reading
Literature Network forum
Book Club forum

Nice site dedicated to fantasy and sci-fi genres is http://www.fantasticfiction.co.uk.
From the site:
Bibliographies for over 10,000 authors. Use the browse menu on the left to find an author by surname, or use the search boxes on the right to search for an author or book
Information on over 200,000 books. Throughout the site, just click on a book to see its cover picture, description and publication details
From the site:
Bibliographies for over 10,000 authors. Use the browse menu on the left to find an author by surname, or use the search boxes on the right to search for an author or book
Information on over 200,000 books. Throughout the site, just click on a book to see its cover picture, description and publication details

Bibliomania has tons of books (classics) that you can read for free online as well as helpful information on research and study guides for a number of texts.
Bibliomania
Bibliomania

They have for the most part. From the Bibliomania FAQ:
"Most texts on our site are in the public domain. However Bibliomania.com Ltd has copyright in the HTML versions we have created for our web site. You are free to download these texts for personal use, but they may not be used for any commercial purpose, or republished in any form (including on the internet) without our prior email permission."
"Most texts on our site are in the public domain. However Bibliomania.com Ltd has copyright in the HTML versions we have created for our web site. You are free to download these texts for personal use, but they may not be used for any commercial purpose, or republished in any form (including on the internet) without our prior email permission."

I came across this site (it helps with book searching), only used it once so far so you'd have to judge for yourselves how good it is..
allreaders
allreaders