LibraryThing is truly a fun and useful little tool! You can download it onto your phone and take it with you while you go book shopping and never get the same book twice! This is a good thing if you have a largeish library that you wish to expand! Yes, I'm a book nerd and love book shopping. Not much on shoes shopping though. Take a look at the first 5 books I entered. I may add more, when I get the time!

http://www.librarything.com/catalog/thaigirl0708