Google Mobile (free): Although scanning was fairly slow and clunky, this is the most interesting of the bunch, as QR scanning is only a tiny part of what this app can manage. In fact, Google Mobile may eventually kill off QR codes altogether, as its incredibly sophisticated software will let you point your smartphone’s camera at just about anything and Google supplies what it reckons is the most relevant info: scan a shop front and you might get opening times and contact details; scan a company logo and get a link to their website; scan a painting and you might get links to the artist’s biography and exhibitions. This is very, very impressive stuff.