SAN JOSE, Calif. -- For a growing number of shoppers this holiday season, the difference between offline and online will be no line at all.
With an avalanche of new smart phone apps just in time for Black Friday, these handheld shopping tools are redefining the art of consumption, blurring the distinction between the in-store experience and the virtual world of information now available in the palm of your hand. Advances in location-based technology, bar-code scanning, price-comparison apps and social-networking tools have turned the mobile device into a sweaty-palmed third channel of commerce, empowering consumers while challenging retailers to rethink the way they do business.


