Efficiency-oriented Shopperati will be watching a new search engine now in beta testing. ShopWiki says it will crawl more than 120,000 stores “to ensure you find the best product and price available.” From our own experience we know that “crawling stores” can be painful, but someone’s got to do it. Anyway, the new service, which we’ve added to our list of search engines, will scan the Internet, searching more than 300,000 Web sites, to find more stores and show results only from “true retail outlets.” ShopWiki also plans a wiki component to encourage its users to add their info to buying guides. Not much in the way of wiki activity there yet, but we tried a few sample searches and were pleased with a bevy of useful results. A potentially promising tool.