Many book recommendations and helpful lists of best books by genre, books for bookgroups etc.
Radio 4's bookclub with lists of current and previous book choices and an invitation to attend the recordings.
Radio 4's guide to running a bookclub
An independent online bookstore with recommendations by genre.
Bibliographies of 7000 authors, info on 150,000 books and a list of the shortlists for all major awards, past and present.
Register in the reader's group section to find reviews, recommendations, themed books and the opportunity to preview some of Penguin's books.
An American site with biographical notes on the major authors and detailed analyses (plot summaries, character lists, chapter by chapter analyses, themes etc.) on classic books.
Detailed American site with guides and discussion questions to hundreds of books.