Lulu, a book publishing site, is in the news this week. But there are many more sites for book reviews, self-publishing and exchange. Here are more than 50 of our favorites.

Disclosure: Lulu currently has an ad campaign running on Mashable.

Book Reviews

Amazon.com - Search from thousands of books, buy them online and read excellent reviews.

Booksprice.com - Users can search and compare prices of new and old books from all major stores.

Bookswellread.com - Users can share reviews of some of their favorite books with others.

Titlez - Users can perform a comparative analysis of a book or group of books with other books in the market.

Whatshouldireadnext.com - Users enter their favorite book and they are a recommended a new book based on analysis of the reading preferences of other registered users.

Book Communities

aNobii - A great way to create book listings, interact with people and express thoughts.

Booksconnect.com - A site which connects book lovers, writers and resellers. Users can discuss with each other, stay updated about events or network with interesting people.

BookJetty.com - Community site where users can tag their favorite books.

BookRevyoo.com - Users can read and rate books from multiple categories.

BooksWellRead.com - Excellent community for book readers looking for recommendations.

Connectviabooks.com - People can create list of read books and share their opinions with others.

Delicious Library - Browse the stream of books shared by other users.

Douban.net - Users can find interesting books recommended by other members and participate in discussions & reviews about a particular book.

Facebook.com Favoritebooks - Developer application on Facebook allowing users to share their favorite books with other users who can write comments.

Goodreads.com - Users can keep a track of books read by them, find out what their buddies are reading and also get recommendations from others who have read a book.

LibraryThing.com - Enables users to create an online catalog of books.

Project Gutenberg - Excellent platform for collaborative sharing of books.

Reader2.com - Users can find new books and recommend their own books to others.

Shelfari.com - An online shelf for sharing favorite books with friends.

Squirl.info - Nice way to share & organize information about books.

Storycode.com - A site for making book recommendations to other users.

Tagabook.com - A tagging site for book lovers allowing them to tag their favorites.

Vitalsource.com - Users can purchase their text books, download them and keep the mobile books with them all the time.

Zestr.com - Cool way to create a catalog of books online.

Publishing

Bibli - Book publishing & sharing platform for poems, scripts, short stories, novels etc.

Blurb.com - Create and sell books.

deusto.com - Book publishing platform for writers to create digital books.

Glypho.com - Collaborative platform for reading and writing books.

Mixbook.com - Users can create amazing books by mixing stuff like pictures to create books in collaboration with their friends.

Sharedbooks.com - Users can publish their information from multiple sources in the form of a structured printed book.

Book Search & Exchange

Americabookshelf.com - One of the largest book exchange clubs across the US.

BookCrossing.com - A community of users from over 130 countries who exchange books with each other at public places like cafes, parks etc.

Booksfree.com - A large and the most extensive library of books.

Bookhopper.co.uk - Free community for UK residents to share used books with each other.

Bookins.com - Book sharing website enabling members to exchange used books with each other in real time.

BookMooch.com - An interesting concept where users can exchange books with others through points. Users gain points when they give books to others.

Booksalescout.com - Online community of users allowing them to sell books in the US.

Bookswim.com - Book borrowing service with free shipping for registered website users.

Feedbooks.com - Users can search & download free PDF books from the internet.

Google Book Search - One of the best search engines for books allowing users to preview some chapters from the book they’d like to buy.

Lazylibrary.com - Special search engine for readers looking to read short books with less than 200 pages.

Live Search Books - Platform for searching books of interest online.

Manybooks.net - Users can search for free ebooks for their PDA, ebook reader or iPod.

PaperBackSwap.com - Users can share books amongst each other and only pay for the delivery charges.

Pazap.com - A book trade engine for students to buy and sell old books.

Read It Swap It - A free service that allows users to exchange books with others.

Socialbib - Book swapping network between students, the website does the searching for books.

Whatshoulditreadnext.com - Users enter a book of their preference and the search engine recommends books on the basis of reading habits of other users.

Worldcat.org - Extensive catalog of books available for viewing and downloading.

Others

bibliophil.org - Users can monitor their library books with public or private security access.

LeapTag.com - newsreader that picks users reading preferences and understands the books that they like.

Thatscrazyhot.com - A cool bibliography generator for book titles.