I work for a local government and we've just started using QRCodes in our parks and downtown art exhibits. Concurrently, those of us in the IT dept who resisted the iLemming craze have recently latched on to the Evo - and lemme tell you - Android rocks at QR codes.
Of course, being a geocacher wanna-be, my first thought was how can I use this in the field? Given GC's restrictions, I wondered if it could be as simple as creating a QRCode that simply takes the GC'er to the log page of the cache? Or maybe coordinates to a bonus cache? That way it wouldn't be *required*, just darn convenient.