In japan, (and might be the same in kenya or some african countries) we have a mobile banking system. the mobile's ic is corresponding to the bank account, we can pay for many things with our phone; train, convenience store, and so on.
then, it would be interesting to keep track of one's household accounts automatically with the data...
more than that, with google goggles, maybe we can recognize what the product is, and we can have logs of what for we used money with pictures.
.... oh... recent idea is too cheap....
sorry for that... ><
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