I have a good USB hand scanner that I was going to do the same with my home collection of books - that was until I figured out that the majority of my books didn't have ISBN's or reliable UPCs... (still planning to use it for my DVD collection)
Do you have software that will pull in the data about the book or are you just hand cataloging?
If you need software, I wrote a small app that pulls in info based on ISBN using a Google API.
It grabs stuff such as Title, publisher, publish date, # of pages, description (back cover type stuff), author(s), and cover art.
Do you need that sort of thing as well?
I hope to find time to stop by the space within the next week or so. Family stuff has kept me swamped for the past month, but hopefully I'll get some free time soon.
-Daniel