Book Buddy

When you buy as many books as I do, both hardcover and e-books, it's sometimes easy to forget just what I have, what I've read, and what I still want to buy. So, how do I do it?
Bookbuddy!

It's an app from iTunes, and I'm able to add all the books I buy either by searching online, or by simply scanning the bar code from the back of the book. It keeps track of each book, when I bought it, when I started reading it, when I finished reading it, and my rating and any notes about it. I can put books into different categories, and attach any book to multiple tags. I love my book buddy!