Here are two new betas with iSight scanning:
DVDpedia
Bookpedia
The iSight button is present in both the search window and the add multiple window for continuos scanning of many books.
(The next version will remember to open the iSight window when you get back to the search window for another search if you left it open, as well as have a command-shorcut, I haven't figure out yet.)
Bright light and contrast are ideal settings. And you want to try and get the barcode between the two bars in the video display. (Do not include the supplemental barcode between the bars, just the main barcode as this is what the focus is set to.)