if someone is online all the time, they could as well go for e.g.
http://www.listal.com/

and I have dl this, though not tried it yet, but the barcode scanner sounds great!
http://www.getlibra.com/
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).

Turn your webcam into a barcode scanner
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. You can use a normal barcode scanner (including CueCats) too.