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And now, a word about DEVONthink. They describe it as a "smart information assistant", although you could think of it as a sort of MyResearchBits.
This Economist article describes the use of bar codes in conjunction with mobile phone cameras to provide users with real-time, context-sensitive information. An example of this is the traveller photographing a barcode at a railway station with his mobile phone to obtain train timetables. Despite of varying bar code standards, the author suggests their free, open standard nature will encourage wider adoption.