Many of us have done some online comparison shopping while we're standing in a physical store. Just ask Best Buy. Google, however, is betting that at least some of us want to splurge on a better deal without even leaving the search page: it's expanding Google Shopping product listing ads to include smartphone search results. Run a relevant query and you'll see a small block of store listings, with options to either jump right to a tempting product or visit a location-aware Google Shopping page with a wider selection. Some existing ads automatically fit the bill and should start showing immediately, but we'd expect considerably more of them as companies look to snag customers before they've even considered heading back home.