The Supermarket of the future

I went to the supermarket today. I was wondering how technology can help out supermarkets to change the way they work or help us fulfilling our needs as customers. First thing i recall on uses of technology in supermarkets were all those projects (with no or little success)to create virtual supermarkets on the net . Those projects were not prepared for human beings. People still need to see and touch products. I foresee a supermarket without a great bunch of same products on the shelves. This will get the chance to bring supermarkets more space to show more products. Imagine if you enter the supermarket, then receive a PDA with a scanner (forget about the trolley) then go through and start scanning the products you wish to buy. At the end of the shopping experience go to the cashier, pass your credit card through a POS, pay the receipt, and finally collect your shopping (which is properly wrapped) from a front desk.