Using the web site Library Thing, you can scan in your barcodes (the entire barcode, not just the ISBN - if you have a scanning "wedge" you're in luck) and build your library. (It is an excellent social network - think StackOverflow for book enthusiasts.)
Then, using the TOOLS section, you can export your library. Now you have a text file to import/parse and can create your labels, a card catalog, etc.
