Here is the description of the app from the WorldCat Blog:
Occipital is the developer of RedLaser and it is working on additional search techniques, including searching directly from text. This means you would point your iPhone at a section of text and the program would look it up on the Internet, i.e. Google and other search engines. Occipital and its program, RedLaser, work in conjunction with TheFind, which is the fastest growing search engine for shopping with over 400 million products in its search index.
Thanks to some quick footwork by a few of OCLC's staff and the guys at Occipital, the company behind the iPhone app RedLaser, WorldCat.org libraries now appear within the mobile apps item search pages.
RedLaser users can scan a book and see the libraries near them that have that book. Then they can click to one of those libraries and get hours, phone numbers and driving directions.
We're putting WorldCat.org data to use and putting libraries right in the mobile user's flow.
So here is the issue, if you are looking at old books or books that are of limited distribution, it is likely that they do not have barcodes and so you would have to look the book up directly in WorldCat. But maybe I need to remind you that WorldCat now catalogs the digital copies of the books in Google Books and other digitized resources. If you are looking for an older surname book, it is well worth your time to check to see if the book has been digitized. I was interested in purchasing some older genealogy books about my ancestors but became discouraged with the price for an actual copy of the book. I every case, I was able to find a digitized copy of the book on CD, for sale at a very modest price.
I guess the key feature of this new technology is availability. These new programs are making genealogical information available that has been locked away in special collections or available only in a few libraries.