This $40 Mac app can use your built-in iSight camera (or any USB camera) to read the barcodes on books, CDs, games, and more. It then looks up all the information for the object, including a cover shot, and places it in a simulated bookshelf on your screen. I was stunned by its simplicity, beauty, and ease of use.

If you seriously want to organize your books, CDs, and games, this seems like a great place to start.

Delicious Library:
Library Screenshot