With the Israeli-developed ShelfX, you scan the item yourself as you take it off the shelf. No checkout queues whatsoever. Now we just need to get rid of those trolleys and I may even enjoy shopping!
http://nocamels.com/2011/11/no-more-cashiers-in-supermarkets-scan-all-items-with-your-phone/
http://www.youtube.com/watch?v=2JemToWEsnw&feature=player_embedded