Libra is a library software to organize your stuff: Books, Audio CDs, Movies, & Games (for a start). And it does so beautifully, and at an amazing price ($0 for non-commercial use).  
 
Hook up your webcam, and Libra turns it instantly into a barcode scanner. Point your webcam towards the barcode (in any orientation) on the back of your books, DVD's or CD's and Libra will auto-retrieve the product information automatically, and add it to your library.