![](http://pics.livejournal.com/nekosd43/pic/00038y39/s640x480)
Just found an iOS based application that catalogs personal libraries in an itunes-esque fashion. It has a barcode scanner that works with my webcam, and hooks up to Amazon and the ISBN database to retrieve data, AND it features a library checkout system to keep track of who you lend your books to.
I've died and gone to heaven. Cue the rest of my vacation being spent on scanning and organizing my 600+ books digitally.