We are currently doing this blue-tooth enabled promo on bus shelters for our client Cycle Agarbatti in Bombay. Essentially one can download ring-tones, Ganapati wall-paper, the cute Cycle Agarbatti radio spot(it's got a non-commercial ring to it) on the mobile phone...The bus-shelter also plays the aarti tune twice everyday. Grateful to Suresh, the CEO of Telibrahma and his team for being the technology partner on this...
In isolation, it's not a big deal/ promo but it's good learning to play with technology ...Next is what:-)
P.S. More about this promo here