For all the book lovers our there (of which I am one), I have recently been playing with a great online tool. It is called Library Thing (http://www.librarything.com) and it can be used to catalog the books you own, have read and want to read. You can see my current library at http://www.librarything.com/catalog/rossdotparker, and an example book (given to me by a lovely former colleague) at http://www.librarything.com/work/4986/book/51122473. All the books can be reviewed, commented upon, rated and tagged for others to see your views and for you to track your thoughts on the book.
Plus, the site will recommend books you might like based on the books in your catalog.