To choose the means whereby we put our products on the world-wide-web, we proceed by a process of elimination. The chief criteria for judging a shopping cart is the number of credit card processors and shipping services it supports, and the number of people that support *it*. Why? Because credit card processors and shipping services mutate all the time, and thus your cart will require updating. Which service works today may go out of business tomorrow, and leave you with the orders…