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Blogger Daniel (who has asked Lifehacker readers for creative photography ideas in the past) runs down the pros of QR codes in a post on his site, including links to resources for use on a bunch of mobile devices. I must admit QR codes have always seemed a little gimmicky to me (a lot of their proposed uses centre around advertising), but printing them on a business card could be useful.
Angus has been writing professionally about technology since 1994 and breaking it for even longer. He is based in Sydney but spends a frankly unhealthy portion of his life on the road, tracking down the latest stories. In 2011, he won the IT Journo Award For Best Consumer Technology Journalist and Consensus IT Writers Award for Best Technical Writer for his work on Lifehacker; about time too.