One of the things I loved most about Fry's was that clearly an engineer designed their checkout line. It's the only retail checkout line I've ever seen that fully embraced queueing theory. They had one long line that everyone got into, and a load balancer up front that would direct you to an open check stand, and at least at the store I went to, in their hayday they had 30 registers open at once!
Unfortunately, they redesigned the shop a few years ago and got rid of that.