>>Anybody successfully used a mobile web application (e.g. ASP.NET web forms, or MVC) on a tablet computer (e.g. Nexus 7) and scanning barcodes?
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>>If you have done it, can you recommend barcode reader software or hardware you used?
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>As there are some price comparison apps out in the wild working through the device camera and store barcodes, why don't you research along that path? No own expirience here...

I looked at that for a client and we determined that with present technology it's impractical for high volume commercial applications because it's too slow.
The camera reads the barcode as a massive image and actually decodes it bit by bit.