Are shopping search engines run by Google and other tech giants doing their jobs? Recent research suggests not. Digging deeper into the matter, Search Engine Land now plans to run its own “fully documented” tests. “Every few days, we’ll search for an item and show what we found, starting with today’s test, a search for a toaster.” Given the messy state of product search, SEL’s Danny Sullivan said comparing competing service providers couldn’t be tougher.