There are several projects doing this. I read a story about a couple of apps on Google's Android that do this and then place flags on a map where yo could find the item close by as well (price comparison).
It had a link to 4 code projects for doing exactly that, unfortunately I cant find the link right now, but might be able to tomorrow when I am on my other computer.
I'll try to think about posting it here if I find it.
If not search, "android google book bar code camera" that might lead to a few things.
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