Hi, this might be a useful tool for bookworms and library-rats: librarything.com
Personally i use librarything.nl because flemish is my mother tongue, but it takes any book from any language and the websites of each country all connect so it doesn't matter which version you use.
I find it a great tool to keep track of my reads and especially of 'to read' titles. My memory isn't what it used to be... Librarything is connected with over 700 library and online-shop catalogues (incl. Libary of Congress, Amazon, Public and University Libraries, ...) WORLDWIDE and allows very easy retrieval of book per author, title words, isbn, ....
Also, it shows you the titles other members with similar collections are listing, much like Amazon, except here it's about books READ and not books BOUGHT.
It does a lot more than this, like listing book events near you etc. etc. but, well...discover! Learning is fun.
Contact me if you like to share your collections there and/or if you want more information.