Raspberry PI could be the Touch screen POS.
We (YoungPOS) just completed the Touch screen POS (Point of Sales) with Raspberry PI. We call it Raspberry POS and it could connect to Receipt Printer, Kitchen Printer, Barcode Scanner and Magnetic Stripe Reader (MSR). It is really full POS system for Restaurant and Retails. We could share this project to everybody who interested in POS solutions. You could visit us at www.facebook.com/raspberrypipos to see these pictures/videos or you could share some information.
Connect to Receipt Printer, Kitchen Printer, Barcode scanner, MSR, Cash Drawer