I hate to say this but this still suffers from all the issues that previous suggestions for point of sale stuff has, in that it takes a great deal of time comparatively to confirm the transaction is actually valid. People aren't going to wait around for a quarter of an hour after buying a stick of gum to wait for a transaction to verify.
If you actually watched the video you would have noticed that the actual payment was recognized within seconds, and if you did any cursory research on the subject you would have realized it's infeasible to do a double spend for a small amount and as such it is very safe to accept small transactions without confirmations.
What do you think, how cheap could a hardware solution based on this be put together? I'm thinking old, used laptop (maybe an Eee PC) plus smallish external monitor. Maybe all in all for $150? Maybe less? .. I think we could reach the point, where this is a straightforward and
Jav, your work is really exciting. but the space is a problem. If a merchant has to find a place for another PC or Laptop in their store, it will not be the ultimate solution.
Many stores are already switching to cash registers with displays for the customer, at least in the Netherlands, so things like this could easily be integrated into existing POS platforms.
This seems like a great solution for smaller stores, but larger stores or chains that use custom POS platforms would benefit a lot from a standardized 'POS API' (as opposed to the usual Bitcoin API) that also allows for communication with a remote Bitcoin client (which will be the case in a store with multiple payment terminals/counters, where everything has to be handled by one central 'cash register server'), and that can be used without a GUI frontend - effectively making it very easy to implement Bitcoin into an existing POS solution without any knowledge about the underlying system.