I would like to give a shout-out to www.fantasticfiction.co.uk. It's a great website for book enthusiasts. You can look up books by author, title, or subject. You can see all the books by a certain author. You can see more books like the one you're viewing; so you can look up a book you've read and see other ones like it. It's a really good website for people looking for something to read.
The link is down at the bottom of the blog, on the Links gadget. Enjoy!