If you happen to be in New York City and anywhere near Grand Central Terminal and you fancy a coffee, then why not go and check out what may well be one of the very first iPad cash registers at a well-known coffee shop in the area (in Graybar passage off Lexington Avenue) called Joe, as featured on Cult Of Mac. The iPad cash register has been introduced into the coffee shop by ShopKeep.com who have previously designed Mac and PC point-of-sale apps. Aside from looking cool and being a bit of a talking point, the iPad cash register prints out receipts, transmits sales to BackOffice on the web enabling real-time tracking of sales, and even makes a nice tinkling sound when you ring up a sale.
According to ShopKeep.com, the iPad app has been primarily designed for coffee shops, bakeries, small cafes and any small, quick-serve retail environments.
Source: iPad Cash Register Arrives at Grand Central Coffee Shop | Cult of Mac